WO2022056565A1 - Dispositif et procédé de fabrication d'un produit en fibres moulées - Google Patents

Dispositif et procédé de fabrication d'un produit en fibres moulées Download PDF

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Publication number
WO2022056565A1
WO2022056565A1 PCT/AT2021/060325 AT2021060325W WO2022056565A1 WO 2022056565 A1 WO2022056565 A1 WO 2022056565A1 AT 2021060325 W AT2021060325 W AT 2021060325W WO 2022056565 A1 WO2022056565 A1 WO 2022056565A1
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WO
WIPO (PCT)
Prior art keywords
mold
core mold
cast
transfer
product
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/AT2021/060325
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German (de)
English (en)
Inventor
Peter Paul Payr
Johannes PAYR
Hans Peter Arledter
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.)
PAYR ENGINEERING GmbH
Original Assignee
PAYR ENGINEERING GmbH
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 PAYR ENGINEERING GmbH filed Critical PAYR ENGINEERING GmbH
Priority to PL21777403.3T priority Critical patent/PL4214362T3/pl
Priority to HRP20250006TT priority patent/HRP20250006T1/hr
Priority to ES21777403T priority patent/ES3007357T3/es
Priority to EP21777403.3A priority patent/EP4214362B1/fr
Priority to RS20250040A priority patent/RS66398B1/sr
Publication of WO2022056565A1 publication Critical patent/WO2022056565A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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 invention relates to a device for producing a cast fiber product comprising a three-dimensional core mold that can be immersed in a pulp or washed around by a pulp, which is mounted on a carrier plate, the core mold having openings to which a vacuum can be applied to suck in the pulp, a transfer mold , which corresponds to the negative mold of the core mold that has been expanded by the wall thickness of the cast fiber product before compacting, and to which a vacuum can be applied via openings in the transfer mold to take over the cast fiber product from the core mold, as well as drive means for moving the core mold and/or transfer mold in order to transfer it of the molded pulp product between the molds.
  • the invention also relates to a method for producing a molded fiber product using such a device, wherein the openings in the core mold have side walls protruding into the interior of the core mold, these side walls each being largely aligned at an acute angle to the direction of withdrawal of the molded fiber product when it is removed from the core mold are.
  • the mold is immersed in pulp and the pulp is applied to the mold by sucking off the solvent.
  • this sticking to the screen means that only very simple shapes can be produced, and the wall thicknesses must also have a certain thickness during the production process in order to avoid tearing of the fiber cast product when it is removed from the mold.
  • the removed fiber cast products are further dried by the action of heat according to the methods of the prior art, as a result of which the manufacturing process is slow and associated with increased energy costs.
  • the JP s5927440 B 2 shows a fiber casting mold with a core mold with conventional through openings arranged in the form of a sieve.
  • the inner side walls of these through-openings are in each case aligned normal to the respective surface and not in the pull-off direction of the fiber cast product.
  • An outer shape is also shown, which in some embodiments also has slit-shaped openings.
  • this outer mold does not serve to support the pulp during the suction process, but rather smoothes the outside of the cast fiber product by moving the outer mold relative to the core mold during the suction process.
  • the WHERE WO 2016/101976 A shows specific configurations of the inner sidewalls of the openings in a core mold.
  • a specific orientation in the drawing direction of the molded fiber product in a majority of the inner side walls of the openings in all sections of a core mold is not disclosed.
  • the GB 2456502 A , the WHERE WO 2020/150779 A , the EP 0466653 A as well as the EN 4424936 A show other core shapes with conventionally arranged screen-shaped openings, each provided with inner sidewalls oriented normal to the surface.
  • An object of the present invention is to significantly improve the fiber casting apparatus, particularly the casting mold.
  • the casting mold should be inexpensive to produce and also allow complex shapes of cast fiber products to be produced, even with very small wall thicknesses.
  • the initial dewatering during the manufacturing process is to be significantly improved, which will significantly reduce energy consumption during the drying process.
  • this object is achieved on the one hand by a device mentioned at the outset, in which at least some of the openings in the core mold are designed as gaps between lamellae aligned approximately parallel to one another, the gaps and thus also the lamellae being preferably arranged on those surfaces of the core mold which are oriented steepest to the pull-off direction of the molded fiber product with respect to the entire core mold.
  • a device mentioned at the outset, in which at least some of the openings in the core mold are designed as gaps between lamellae aligned approximately parallel to one another, the gaps and thus also the lamellae being preferably arranged on those surfaces of the core mold which are oriented steepest to the pull-off direction of the molded fiber product with respect to the entire core mold.
  • Such a shape can also be produced with more complex geometries, for example by 3D printing processes.
  • Any number of openings in the form of suction channels can be provided along the surface of the core mold. Due to the orientation of the inner side walls of the suction channels, the
  • the arrangement of the gaps on the steeper sections of the surface of the core mold has turned out to be a particularly effective shape for the suction openings.
  • a large number of lamellae arranged closely next to one another with gaps in between can be provided.
  • this shape of the openings has turned out to be particularly advantageous, especially in the area of very steeply inclined surface sections of the surface of the core mold, which are almost oriented in the direction of withdrawal.
  • the gaps allow negative pressure to be applied over a large part of the surface of the molded fiber product, resulting in effective suction.
  • the openings in the core mold are designed as bores distributed in a grid pattern over the surface of the core mold.
  • the suction openings can be provided as bores distributed in a grid pattern, particularly in those portions of the surface of the core mold which are oriented more normally to the direction in which the fiber cast product is drawn off. If openings are provided in the finished cast fiber product, then no suction openings can be provided on the corresponding sections on the surface of the core mold, which means that the fibers from the pulp do not rest in these areas.
  • connecting webs are provided between the lamellae in the gaps to stabilize the core mold, with the connecting webs being offset inwards in the gaps in steps relative to the surface of the core mold, so that a vacuum can also be applied in the area of the webs .
  • the slats are designed to be correspondingly longer, especially in the case of relatively steep surface sections. So that the gap width between the slats can be kept constant, it is necessary to provide connecting webs between the slats at regular intervals.
  • the connecting bars are offset into the gaps relative to the surface of the core mold, so that the vacuum applied can continue to act on the fiber cast product over the entire length of the gaps.
  • overpressure can be applied to the core mold to blow out the fiber cast product. This further facilitates the removal of the finished molded fiber product when transferring the product to a transfer mold.
  • the object of the invention is also achieved by a method according to the invention for producing a cast fiber product with the aid of the device described above.
  • a procedure includes the following steps: -) Dipping the core mold into a pulp or flushing the core mold with a pulp and applying a vacuum to the openings in the core mold, whereby a layer of fibers is applied to the core mold while the solvent is sucked off through the openings, -) removing the core mold from the pulp while further sucking off the remaining solvent and merging the core mold and the transfer mold, -) Pressing the core mold and the transfer mold together, whereby further solvent is sucked out of the fiber product, optionally with vacuum and compressed air support.
  • -) Transferring the cast fiber product to the transfer mold by adhesion forces becoming effective and, if necessary, by applying a negative pressure to the openings in the transfer mold and, if necessary, an overpressure to the openings in the core mold.
  • the product is pressed between the transfer mold and another dry press mold for further mechanical dewatering, with a vacuum being applied either to the transfer mold or to the dry press mold to ensure a defined flow is applied to remove the pressed-out solvent, and after the pressing process the fiber cast product is transferred back to the transfer mold.
  • a vacuum being applied either to the transfer mold or to the dry press mold to ensure a defined flow is applied to remove the pressed-out solvent, and after the pressing process the fiber cast product is transferred back to the transfer mold.
  • an overpressure can also be applied alternately to support the desired direction of flow at the other mold.
  • a small proportion of the mechanical dewatering takes place by pressing the molds together during the transfer between core mold and transfer mold.
  • the main part of the mechanical dewatering is then carried out between the transfer mold and another dry press mold.
  • the dry press mold largely has the shape of the core mold.
  • the cast product produced is mechanically dewatered, as a result of which the dry content of the product is increased by at least 10-30%.
  • significantly less energy has to be used in the subsequent drying steps using heat treatment and the production times are significantly reduced.
  • the extensive outsourcing of the mechanical dewatering step with the help of an additional dry press mold has the advantage of significantly reducing the cycle times for the creation of the pulp product, since the core mold is free again immediately after the first transfer to the transfer mold to be dipped into the pulp during the mechanical pressing step is carried out using the dry press mold.
  • the molded fiber product is oriented so that the narrowest side or one of the narrowest sides of the molded fiber product faces downward. Surprisingly, it has been shown that the orientation of the cast fiber product during the pressing process has a decisive effect on increasing the dry content.
  • the position of the core mold ensures that the sucked-off water is guided away from the fiber fleece and that there is no rewetting due to capillary action.
  • the transfer to the transfer form takes place mainly through adhesion forces. This pressing process has little effect on the dry content. This was mainly achieved by the previous suction process on the way to the transfer form.
  • a vacuum is applied either to the transfer mold or to the dry press mold to ensure a defined flow for removing the pressed-out solvent.
  • the position of the molds ensures that there is no rewetting.
  • the solvent present in the still moist pulp will move to this area by gravity, causing the upward facing parts of the molded pulp product to have an increased dry content even before pressing. Similar to a funnel, the water converges in the narrowest part of the product. During the subsequent pressing process, during which suction continues to take place via the openings in the core mould, the solvent in the lower area can no longer escape and is effectively pressed out of the cast fiber product.
  • the molded fiber product is transferred to a heated mold for further drying and shape stabilization.
  • the stabilization of the shape of the fiber cast product can be further improved, particularly in the case of products with small wall thicknesses.
  • This step can either take place directly between the original transfer mold and the heated mold, or a transfer to the heated mold can take place and the heating and shaping step then takes place between the heated mold and another transfer mold, which can also be heated.
  • FIG. 1 shows a schematic perspective view of a possible embodiment of a core mold for a device according to the invention
  • 2 shows a schematic detailed sectional view through an embodiment of a core mold
  • FIG. 3 is a schematic perspective view of the underside of the core mold of FIG. 1
  • 4 is a perspective view of an embodiment of a transfer mold
  • 5 is a perspective view of one embodiment of a dry press mold.
  • the core mold 2 shown schematically in FIG. 1 is designed as an example for the production of a cup. However, much more complex shapes can be produced depending on the application. The only condition is that there must be no undercuts in the pull-off direction 7 of the cast fiber product 1 (see FIG. 2), which would prevent the cast fiber product 1 from being pulled off.
  • the core mold 2 has a carrier plate 3 . Openings in the form of bores 4 are provided in the flatter sections, which are oriented more normally to the drawing-off direction, and openings in the form of gaps 5 are arranged between lamellae 9 in the steep sections.
  • the lamellae 9 and gaps 5 are preferably aligned with the draw-off direction 7, so that the gaps run as perpendicularly as possible along the steep surfaces.
  • FIG. 2 shows a detailed section of the core mold 2 from FIG.
  • the core mold 2 can, for example, be glued or tightly screwed to the carrier plate 3 or be manufactured in one piece together with the carrier plate 3 . Vacuum can be applied to the openings 4.5 of the core mold 2.
  • the inner side walls 6 of both the bores 4 and the gaps 5 are largely aligned in the direction of the withdrawal direction 7, which is represented by an arrow.
  • the fibers of the cast fiber product 1 shown in dashed lines are therefore also aligned in the direction of the withdrawal direction 7 when they are placed in the area of the openings 4, 5, which makes it particularly easy to remove the cast fiber product 1, especially in the steep sections of the surface 8.
  • the novel core shape also allows pulps with a high solvent content and particularly short fibers to be used, which allows the production of more complex shapes and products with thin wall thicknesses.
  • FIG. 3 shows the core mold 2 from FIG. 1 in a view obliquely from below.
  • the connecting webs 10 are also clearly visible here, which connect the individual slats 9 to one another at a distance from the surface 8 .
  • FIGS. 4 and 5 show an embodiment of a transfer mold 11 and a dry press mold 13.
  • the molds 11, 13 are used here to produce a shell-shaped cast fiber product 1.
  • the transfer mold 11 has openings 12 for applying a negative pressure or positive pressure.
  • the dry press mold 13 also has openings 14 distributed over the mold for applying a negative pressure or positive pressure.
  • the dry press mold 13 has essentially the same shape as the core mold 2 intended for this product, with the difference that the core mold has differently shaped openings. In the steep wall sections in particular, the openings in the core mold would be in the form of columns 5 .
  • the sequence of the method for producing a molded fiber product is described in more detail below.
  • the pulp is prepared by combining the fiber material with one or more solvents and optionally additives in a disperser.
  • fibers with a diameter of 1 to 10 ⁇ m are used in the pulp.
  • cellulose fibers, waste paper or other natural vegetable fibers can be used as fibers.
  • Water is usually used as the solvent.
  • Various adhesives, for example, or also substances for changing the pH value can be added as additives.
  • the core mold 2 mounted on a support plate 3 is dipped into the pulp.
  • the core mold 2 is fixed on the carrier plate 3 in such a way that both negative and positive pressure can be applied within the core mold.
  • the negative pressure applied is usually around 100 mbar or 10 kPa. In the case of coarser fibers, a somewhat higher pressure difference may be necessary in order to deposit the fibers quickly.
  • the core mold 2 is removed from the pulp and brought together with a transfer mold 11.
  • the transfer mold 11 corresponds to the negative mold of the core mold 2, but expanded by the wall thickness of the cast fiber product 1 before compression.
  • the very soft cast fiber product 1 is pressed out between the core mold 2 and the transfer mold 11 using mechanical pressure.
  • the core mold 2 continues to be suctioned off in order to quickly remove the excess solvent during the pressing process.
  • an overpressure may also be applied briefly via the suction openings 12 in the transfer mold 11 in order to further accelerate the mechanical removal of the solvent during the pressing process.
  • the core mold 2 is thus ready for the next casting. So that the cycle times can be kept short, the step of mechanical dewatering by pressing the cast fiber product 1 can also take place between the transfer mold 11 and another dry press mold 13 . As a result, the core mold 2 is free again immediately after the shaping step and the transfer to the transfer mold. It is advantageous if the molds are aligned during the mechanical dewatering step in such a way that the solvent still contained in the cast fiber mass collects at a narrow point of the cast fiber product due to gravity. As a result, it can be removed more effectively from the pulp mass during the pressing process, which makes the mechanical dewatering step even more efficient.
  • the cast fiber product 1 is transferred with the transfer mold 11 to another mold, similar to the core mold 1, and heated there in order to achieve further drying and shape stabilization. In about 10 to 30 seconds, enough water has evaporated so that the cast fiber product 1 becomes stable and no longer warps during subsequent drying in the air or during subsequent drying if there is still residual moisture.
  • the inner surface of the cast fiber product 1 is also smoothed by the heated mold, which in many cast fiber products 1 brings with it an increase in usability and quality.
  • production cycle times can be as little as one second.

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  • Manufacturing & Machinery (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un dispositif destiné à fabriquer un produit en fibres moulées (1) qui comprend une boîte à noyaux (2) pouvant être immergée dans une pulpe, ladite boîte à noyaux étant montée sur une plaque de support (3), ladite boîte à noyaux (2) comportant des ouvertures sur lesquelles peut être appliquée une pression négative pour aspirer la pulpe, un moule de transfert (11), qui correspond au moule femelle, de la boîte à noyaux (2), élargi de l'épaisseur de paroi du produit en fibres moulées (1) avant le compactage, et auquel une pression négative peut être appliquée par l'intermédiaire d'ouvertures ménagées dans le moule de transfert, de manière à recevoir le produit en fibres moulées (1) provenant de la boîte à noyaux (2), ainsi que des moyens d'entraînement destinés à déplacer la boîte à noyaux (2) et/ou le moule de transfert, de sorte à permettre un transfert du produit en fibres moulées (1) entre les moules. Les ouvertures ménagées dans la boîte à noyaux (2) présentent des parois latérales faisant saillie à l'intérieur de la boîte à noyaux (2), lesdites parois latérales (6) étant orientées chacune en majeure partie à un angle aigu par rapport au sens d'extraction (7) du produit en fibres moulées (1) lors du retrait de la boîte à noyaux (2) et au moins une partie se présentant sous forme de fentes. L'invention concerne en outre un procédé de fabrication d'un produit en fibres moulées au moyen d'un dispositif de ce type.
PCT/AT2021/060325 2020-09-16 2021-09-14 Dispositif et procédé de fabrication d'un produit en fibres moulées Ceased WO2022056565A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PL21777403.3T PL4214362T3 (pl) 2020-09-16 2021-09-14 Urządzenie i sposób wytwarzania produktu odlewanego z włókien
HRP20250006TT HRP20250006T1 (hr) 2020-09-16 2021-09-14 Uređaj i postupak za izradu lijevanog proizvoda od vlakana
ES21777403T ES3007357T3 (en) 2020-09-16 2021-09-14 Device and method for producing a moulded pulp product
EP21777403.3A EP4214362B1 (fr) 2020-09-16 2021-09-14 Dispositif et procédé de fabrication d'un produit en fibres moulées
RS20250040A RS66398B1 (sr) 2020-09-16 2021-09-14 Uređaj i postupak za proizvodnju produkta od livenih vlakana

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA60285/2020 2020-09-16
AT602852020A AT524245B1 (de) 2020-09-16 2020-09-16 Vorrichtung und Verfahren zur Herstellung eines Fasergussprodukts

Publications (1)

Publication Number Publication Date
WO2022056565A1 true WO2022056565A1 (fr) 2022-03-24

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PCT/AT2021/060325 Ceased WO2022056565A1 (fr) 2020-09-16 2021-09-14 Dispositif et procédé de fabrication d'un produit en fibres moulées

Country Status (8)

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EP (1) EP4214362B1 (fr)
AT (1) AT524245B1 (fr)
ES (1) ES3007357T3 (fr)
HR (1) HRP20250006T1 (fr)
HU (1) HUE070396T2 (fr)
PL (1) PL4214362T3 (fr)
RS (1) RS66398B1 (fr)
WO (1) WO2022056565A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022124327B4 (de) * 2022-09-22 2025-12-18 Kiefel Gmbh Reinigungssystem und Reinigungsverfahren, sowie Herstellungsvorrichtung für Werkstücke

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629533A (en) * 1941-02-08 1953-02-24 Chaplin Corp Molded fiber article
JPS5927440B2 (ja) 1975-09-08 1984-07-05 （株） 富士製作所 繊維成形物の吸引抄造装置
EP0466653A1 (fr) 1990-07-11 1992-01-15 Alois Koch Procédé de fabrication de cerceuil en matériau de pulpe formé
DE4424936A1 (de) 1993-07-14 1995-01-19 Jujo Paper Co Ltd Pulpepreßform und Herstellungsverfahren für diese und geformter Pulpeartikel und Herstellungsverfahren für diesen
WO2006057610A2 (fr) * 2004-11-26 2006-06-01 Pakit International Trading Company Inc Procede et machine de fabrication de produits fibreux a partir d'une composition de fabrication et nouveau type de produit fibreux
GB2456502A (en) 2007-11-17 2009-07-22 3T Rpd Ltd A permeable shaping tool, a method of shaping and of handling an article
WO2016101976A1 (fr) 2014-12-22 2016-06-30 Celwise Ab Outil ou partie d'outil, système comprenant un tel outil ou une telle partie d'outil, procédé de production d'un tel outil ou d'une telle partie d'outil, et procédé de moulage de produit à partir de pâte liquide
WO2020150779A1 (fr) 2019-01-24 2020-07-30 Varden Process Pty Ltd Appareil et procédé de formation de produit en fibres de pâte moulée

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629533A (en) * 1941-02-08 1953-02-24 Chaplin Corp Molded fiber article
JPS5927440B2 (ja) 1975-09-08 1984-07-05 （株） 富士製作所 繊維成形物の吸引抄造装置
EP0466653A1 (fr) 1990-07-11 1992-01-15 Alois Koch Procédé de fabrication de cerceuil en matériau de pulpe formé
DE4424936A1 (de) 1993-07-14 1995-01-19 Jujo Paper Co Ltd Pulpepreßform und Herstellungsverfahren für diese und geformter Pulpeartikel und Herstellungsverfahren für diesen
WO2006057610A2 (fr) * 2004-11-26 2006-06-01 Pakit International Trading Company Inc Procede et machine de fabrication de produits fibreux a partir d'une composition de fabrication et nouveau type de produit fibreux
GB2456502A (en) 2007-11-17 2009-07-22 3T Rpd Ltd A permeable shaping tool, a method of shaping and of handling an article
WO2016101976A1 (fr) 2014-12-22 2016-06-30 Celwise Ab Outil ou partie d'outil, système comprenant un tel outil ou une telle partie d'outil, procédé de production d'un tel outil ou d'une telle partie d'outil, et procédé de moulage de produit à partir de pâte liquide
WO2020150779A1 (fr) 2019-01-24 2020-07-30 Varden Process Pty Ltd Appareil et procédé de formation de produit en fibres de pâte moulée

Also Published As

Publication number Publication date
EP4214362C0 (fr) 2024-10-16
HRP20250006T1 (hr) 2025-03-14
AT524245B1 (de) 2022-05-15
EP4214362B1 (fr) 2024-10-16
AT524245A1 (de) 2022-04-15
RS66398B1 (sr) 2025-02-28
PL4214362T3 (pl) 2025-03-31
ES3007357T3 (en) 2025-03-19
EP4214362A1 (fr) 2023-07-26
HUE070396T2 (hu) 2025-06-28

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