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WO2024256714A1 - Pâte pour la production d'une préforme à base de fibres - Google Patents

Pâte pour la production d'une préforme à base de fibres Download PDF

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Publication number
WO2024256714A1
WO2024256714A1 PCT/EP2024/066705 EP2024066705W WO2024256714A1 WO 2024256714 A1 WO2024256714 A1 WO 2024256714A1 EP 2024066705 W EP2024066705 W EP 2024066705W WO 2024256714 A1 WO2024256714 A1 WO 2024256714A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
fibers
fiber
container
additive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/066705
Other languages
German (de)
English (en)
Inventor
Anupam AKOLKAR
Florian MÜLLER
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
Publication of WO2024256714A1 publication Critical patent/WO2024256714A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
    • 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
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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

Definitions

  • the present invention relates to a pulp for producing a fiber-based blank, in particular using a method for reducing the water content in the fiber-based blank.
  • the blank is in particular a container or a closure element for a container.
  • the invention also relates to a container made of pulp.
  • a fiber-based blank in the form of a container was disclosed in WO 2012/139590 A1.
  • so-called pulp is injected into an upside-down mold and pressed against a corresponding wall using a flexible balloon in this mold and compressed accordingly.
  • the pulp is pressed together and heated to a temperature of around 180 °C in order 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.
  • WO 2018/020219 Al discloses another process for drying wet, fiber-based blanks.
  • the blanks are containers.
  • the wet pulp is also pressed together with a flexible balloon inside the mold.
  • the pre-processed container is then demolded 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 the effects of force before drying and must be very must be handled carefully.
  • the container may become deformed, for example due to uneven drying or a non-uniform layer thickness, or it may be damaged by external influences.
  • the moisture content in the blank can vary within the blank.
  • the microwave radiation therefore has an uneven effect on the blank.
  • a pulp for producing a fiber-based blank in particular using a method for reducing the water content in the fiber-based blank, is to be provided, which makes it possible to generate heat uniformly using microwave radiation, in particular independently of the water content during the drying process.
  • a pulp according to the invention for producing a fiber-based blank, in particular a container or a fiber-based closure element for a container comprises water and fibers.
  • the pulp contains at least one additive that is sensitive to microwave radiation.
  • the pulp is particularly intended for use in a method for reducing the water content in a fiber-based blank, in particular in a container or a fiber-based closure element for a container.
  • Substances that are sensitive to microwave radiation are substances whose molecules are caused to vibrate by the influence of microwave radiation.
  • a pulp as described here makes it possible to dry a fibre-based blank produced therefrom with microwave radiation, even if it has a relatively low and/or uneven moisture content.
  • the aggregate is present in a mass fraction that allows the power absorbed by the aggregate to be higher than the power absorbed by the water when the water mass fraction is 30%. In other words, the absorption shifts from the water to the aggregate during the drying process.
  • a method for reducing the water content in a fiber-based blank comprises in particular the following steps:
  • the at least one additive is polar.
  • Materials that are polar have a magnetic orientation. Such materials have an increased interaction with microwave radiation.
  • the aggregate is preferably selected from a list of aggregates comprising silicon ceramic, chitosan, kaolin, CaCOa, gypsum, lime, TiOa, AI2O3, aluminum silicate fibers and carbon nanotubes or a combination thereof.
  • the mass fraction of the aggregate is in particular between 0.1 % and 20 %.
  • the fibers of the pulp are preferably selected from a list of fibers comprising hemp fibers, cellulose fibers, jute fibers, cotton fibers, bamboo fibers, bioplastic fibers and recycled fibers or a combination thereof.
  • these fibers can absorb water and/or the additives themselves, so that when irradiated with microwaves, heat can be generated not only between the fibers but also within the fibers.
  • the mass fraction of fibers in the pulp is between 0.5% and 4%, in particular between 1% and 1.5%.
  • weight information relating to the pulp refers to the state of the pulp before it is introduced into the mold.
  • a further aspect relates to a method for reducing the water content in a fiber-based blank, in particular in a container or a fiber-based closure element for a container.
  • the method comprises the steps
  • the wet fiber-based blanks are typically formed as already known in the art.
  • pulp is introduced into a porous mold or into a solid mold with water-draining channels, the entrances of which are covered with sieves or whose openings are small enough that the pulp fibers cannot penetrate, and the pulp fibers are washed onto the inner wall of the mold so that a wall of a blank, for example a container, is built up.
  • a wall of a blank for example a container
  • the now existing semi-finished product i.e. the wet fiber-based blank, is removed from the mold.
  • the wet fiber-based blank has a water content of approximately 75%.
  • the fiber-based blank can then preferably be provided in a microwave-permeable press form.
  • the wet fiber-based blank can remain inside the mold during the drying process, i.e. while it is being exposed to microwaves.
  • the container is thus protected against external influences and damage or deformation is prevented.
  • the wet fiber-based blank inside 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 achieved from all sides. can be .
  • the wet fiber-based blank has a water content of approximately 5% to 12% . This is particularly useful if the blank is in the shape of a container, for example a bottle.
  • the drying process can also take place outside of a press mold.
  • the wet fiber-based blank is removed from the mold using a suitable transfer device.
  • the wet fiber-based blank is then placed in the open mold or, for example, placed on a conveyor belt. 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.
  • 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.
  • 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 the application of microwaves.
  • Pressure can be maintained on the wall of the wet fiber-based blank.
  • the expandable tool remains inside the wet fiber-based blank. Blank is supported from the inside and undesirable deformation is prevented.
  • the water is preferably heated until it evaporates and is accordingly dif-fused from the wet blank.
  • the fiber-based blank can be rotated during exposure to microwaves, particularly around its own axis. This allows for more efficient use of the microwaves and enables a more uniform energy input into the blank.
  • the microwaves can be applied in a timed manner depending on the water content of the wet fiber-based blank.
  • the power can be reduced by the timed setting.
  • the water content in the wet fiber-based blank is lower and too much energy can cause the blank to overheat in certain places. This can be prevented by reducing the power.
  • the additive still ensures that enough energy is introduced into the blank to evaporate the residual moisture, even if the power is reduced.
  • the microwaves can be applied in a timed manner depending on the composition of the pulp.
  • the composition of the pulp can, or will, change during the drying process. Accordingly, the timing of the microwaves can also change over time.
  • the pulp is provided in a storage container. It is also possible to add the additive to the pulp from the beginning or to mix it into the pulp stream when the pulp is removed from the storage container.
  • a further aspect relates to a container made from pulp, in particular made from a pulp as described herein.
  • the container is preferably manufactured in a process as described herein.
  • the container comprises water, fibers and at least one additive, wherein the additive is sensitive to microwave radiation. This makes it possible to adjust the container to a specific water content in a prior process.
  • the mass fraction of water is preferably less than 8%.
  • the container is therefore stable and dimensionally stable.
  • the mass fraction of the aggregate in the container is preferably between 0.1% and 20%, in particular between 1% and 10%. This ensures that it does not affect the strength and/or quality of the container.
  • Another aspect concerns the use of a microwave sensitive additive in a pulp for producing a fiber-based blank to improve the interaction of microwave radiation and pulp.
  • Figure 1 A device for reducing the water content in a fiber-based blank before exposure to microwaves
  • Figure 2 the device according to Figure 1 during exposure to microwaves
  • Figure 3 shows, by way of example, further typical fibre-based containers which can be produced by means of the method according to the invention
  • Figure 4 shows an example of a typical fiber-based closure that can be produced by means of 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 in the present case a container 100 in the form of a bottle.
  • the blank was made from a pulp which comprises water, fibers and 5% of the additive.
  • the device 200 has a microwave chamber 40 which is closed with a lid 41. In the lid 41 there is an exhaust air opening 42 through which compressed air and/or moisture, such as water or water vapor, can be discharged.
  • the microwave chamber 40 also has a base 43. A plurality of openings 44 are arranged in the base 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 by 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 arranged within the press mold 20. This was taken from a mold before being introduced into the press mold 20 and currently has a water content of approximately 75%. After the wet fiber-based container 100 was introduced into the press mold 20, an expandable tool 30 was introduced into the interior of 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 or moisture contained in the wet fiber-based container 100 is partially pressed out of it.
  • the press mold 20 is designed to be permeable to water.
  • the 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 off through gaps or openings at the separation point of the press mold.
  • the escaping water or moisture is shown stylized as water droplets in the illustration according to Figure 1. These water droplets can drip onto the floor 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 application of microwaves to the wet fiber-based container 100.
  • Figure 2 therefore shows the actual drying process.
  • the device 50 for generating microwaves accordingly, microwaves are generated which are introduced into the microwave chamber 40 through the waveguide 51.
  • the microwaves heat up the moisture 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; however, it is possible for the expandable tool 30 to remain expanded during the process shown here.
  • the moisture shown here stylized by wavy lines, enters the microwave chamber 40.
  • the molecules of the additive continue to vibrate, so that heat is still generated in the container 100. This results in the container being heated evenly or remaining warm, even if some of the moisture has already evaporated and, in relation to the moisture, the container is dry in some areas.
  • a holding device for the microwave-permeable press mold 20 is designed as an integral component 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 corresponding elements on the respective halves of the device 200.
  • Figure 3 shows examples of other typical fiber-based containers that can be produced using the method described here and from the pulp described here.
  • a container 100 can be seen that 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 shape of a bowl, the container 100 '' in the shape of a cup.
  • Figure 4 shows an example of a typical fiber-based closure 300 that can be produced using the process described herein and from the pulp described herein.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Microbiology (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Biotechnology (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Biomedical Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une pâte pour la production d'une préforme à base de fibres, en particulier à l'aide d'un procédé de réduction de la teneur en eau dans la préforme à base de fibres, en particulier dans un contenant ou un élément de fermeture à base de fibres pour un contenant. La pâte contient de l'eau et des fibres. La pâte contient au moins un additif sensible aux rayonnements micro-ondes.
PCT/EP2024/066705 2023-06-16 2024-06-15 Pâte pour la production d'une préforme à base de fibres Pending WO2024256714A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH000645/2023A CH720862A2 (de) 2023-06-16 2023-06-16 Pulpe zur Herstellung eines faserbasierten Rohlings
CHCH000645/2023 2023-06-16

Publications (1)

Publication Number Publication Date
WO2024256714A1 true WO2024256714A1 (fr) 2024-12-19

Family

ID=91585971

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/066705 Pending WO2024256714A1 (fr) 2023-06-16 2024-06-15 Pâte pour la production d'une préforme à base de fibres

Country Status (2)

Country Link
CH (1) CH720862A2 (fr)
WO (1) WO2024256714A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1597369A (en) * 1976-12-03 1981-09-09 Holbek Kjeld Aps Composite material
US5928741A (en) * 1992-08-11 1999-07-27 E. Khashoggi Industries, Llc Laminated articles of manufacture fashioned from sheets having a highly inorganically filled organic polymer matrix
US20040197500A9 (en) * 1997-02-26 2004-10-07 Fort James Corporation Coated paperboards and paperboard containers having improved tactile and bulk insulation properties
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
US20180325755A1 (en) * 2015-11-03 2018-11-15 Kimberly-Clark Worldwide, Inc. Foamed composite web with low wet collapse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1597369A (en) * 1976-12-03 1981-09-09 Holbek Kjeld Aps Composite material
US5928741A (en) * 1992-08-11 1999-07-27 E. Khashoggi Industries, Llc Laminated articles of manufacture fashioned from sheets having a highly inorganically filled organic polymer matrix
US20040197500A9 (en) * 1997-02-26 2004-10-07 Fort James Corporation Coated paperboards and paperboard containers having improved tactile and bulk insulation properties
WO2012139590A1 (fr) 2011-04-15 2012-10-18 Ecoxpac A/S Récipient
US20180325755A1 (en) * 2015-11-03 2018-11-15 Kimberly-Clark Worldwide, Inc. Foamed composite web with low wet collapse
WO2018020219A1 (fr) 2016-07-26 2018-02-01 Natural Resources (2000) Limited Moulage d'articles

Also Published As

Publication number Publication date
CH720862A2 (de) 2024-12-30

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