EP0671504B1 - Verfahren zur Herstellung von geschäumtem Material aus Altpapier und dgl. - Google Patents
Verfahren zur Herstellung von geschäumtem Material aus Altpapier und dgl. Download PDFInfo
- Publication number
- EP0671504B1 EP0671504B1 EP95101694A EP95101694A EP0671504B1 EP 0671504 B1 EP0671504 B1 EP 0671504B1 EP 95101694 A EP95101694 A EP 95101694A EP 95101694 A EP95101694 A EP 95101694A EP 0671504 B1 EP0671504 B1 EP 0671504B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- foamed material
- microwaves
- mold
- producing foamed
- 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.)
- Expired - Lifetime
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J1/00—Fibreboard
- D21J1/06—Drying
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/16—Drying webs by electrical heating
- D21F5/167—Microwave heating
Definitions
- the invention relates to a process for the production of foamed material from waste paper and the like. With any initial shape according to the preamble of claim 1.
- raw materials paper, cardboard, waste cardboard or materials with similar properties can be used, either according to type or as a raw material mixture.
- the invention should preferably make a contribution to environmental protection through the recovery and processing of secondary raw materials, which are available to a considerable extent.
- Various end products can be produced by the method according to the invention, in particular structural elements for heat and impact sound insulation, as well as those for vibration and shock absorption, furthermore roof covering or wall cladding panels, composite panels, other shaped bodies for use as filler material for insulation and packaging purposes. Special treatments are possible by adding, for example, hydrophobicizing agents, flame retardants, putrefactive substances or reaction aids.
- the lists are to be understood as examples.
- An essential known process step is the production of a liquid, vzw. aqueous pulp from the raw materials mentioned, hereinafter referred to as paper pulp, including comminution and mixing of the components.
- the task to be solved was to shorten the known methods in time, which is ultimately the prerequisite for the process to be able to be carried out continuously, for the expenditure on equipment and heat losses to be reduced.
- microwave radiation which is preferably in the range of 915 MHz and 2.45 GHz, instead of the conventional heat treatment.
- the advantages of this method of energy input lie in the fact that, in contrast to heat rays, very high energy densities can be achieved with microwaves and the energy does not act on the paper pulp from the surface, but penetrates into it and heats the liquid directly and evaporates it . With a corresponding energy density, the process takes place so violently that the steam produced, through the creation of paths for its outflow from the volume of the paper pulp irradiated, causes the mass to expand and puts it in a porous state.
- This process is a drying process as a result of the removal of liquid, a material consolidation sets in during the volume increase of the pulp, which stabilizes the voids created in the pulp.
- the process can be supported by foam-forming and stabilizing additives.
- Microwave radiation is able to penetrate materials with a corresponding dielectric constant, for example glass or paper, without loss of energy.
- Other materials absorb microwave radiation, ie they take over the energy of the microwaves.
- This process is also referred to as coupling to the microwaves. This happens in the molecular area and manifests itself in a warming of the coupling material.
- This material includes, for example, water in the liquid state. In a water-containing paper pulp, the energy provided by the microwaves is therefore transferred directly and only to the water molecules. The heat is generated in the irradiated volume, i.e.
- the irradiated body is not dimensionally stable, as is the case with the paper pulp under consideration, then the steam flowing out in the body creates flow paths in the form of cavities.
- the body takes on a porous structure. It loosens up considerably. Its volume increases. Since the hardening process due to drying of the material begins at the same time, this voluminous and porous structure is retained. Certain additives such as binders or foaming agents support this process. In terms of process technology, this means a considerable simplification of the aftertreatment. Otherwise, procedural steps are saved.
- a technical solution for the implementation of this process for the production of foamed material, in particular moldings, depends on the objective of the production and can be operated batchwise or continuously. In terms of apparatus, it must be guaranteed that, taking into account the increase in volume of the pulp, a largely unimpeded irradiation with microwaves is possible and at the same time the water vapor can flow out of the mold uninhibited.
Landscapes
- Paper (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4404322 | 1994-02-11 | ||
DE4404322A DE4404322A1 (de) | 1994-02-11 | 1994-02-11 | Verfahren zur Herstellung von geschäumtem Material aus Altpapier u. dgl. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0671504A1 EP0671504A1 (de) | 1995-09-13 |
EP0671504B1 true EP0671504B1 (de) | 1997-08-06 |
Family
ID=6510008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95101694A Expired - Lifetime EP0671504B1 (de) | 1994-02-11 | 1995-02-07 | Verfahren zur Herstellung von geschäumtem Material aus Altpapier und dgl. |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0671504B1 (fi) |
AT (1) | ATE156541T1 (fi) |
CA (1) | CA2142222C (fi) |
DE (2) | DE4404322A1 (fi) |
DK (1) | DK0671504T3 (fi) |
FI (1) | FI105280B (fi) |
NO (1) | NO307191B1 (fi) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11255051B2 (en) | 2017-11-29 | 2022-02-22 | Kimberly-Clark Worldwide, Inc. | Fibrous sheet with improved properties |
US11313061B2 (en) | 2018-07-25 | 2022-04-26 | Kimberly-Clark Worldwide, Inc. | Process for making three-dimensional foam-laid nonwovens |
US11591755B2 (en) | 2015-11-03 | 2023-02-28 | Kimberly-Clark Worldwide, Inc. | Paper tissue with high bulk and low lint |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5707579A (en) * | 1994-02-11 | 1998-01-13 | Schweitzer, Vodermair & Schimmer-Wottrich Gbr | Process for producing foamed material from waste paper and the like |
EP0740990A3 (de) * | 1995-05-02 | 1997-05-28 | Schweitzer Jacob | Verfahren zur Definition verschiedener Eigenschaften von zellulosehaltigen Schaumstoffen |
DE19546296A1 (de) * | 1995-05-02 | 1996-11-07 | Schweitzer Jacob | Verfahren zur Definition verschiedener Eigenschaften von Schaumkörpern aus zellulosehaltigen Stoffen und verfahrensgemäß hergestellte Schaumkörper |
DE19546295A1 (de) * | 1995-12-12 | 1997-06-19 | Schweitzer Jacob | Verfahren zur Herstellung eines Schaumkörpers aus zellulosehaltigen Stoffen |
KR100232121B1 (ko) * | 1997-06-10 | 1999-12-01 | 허방욱 | 셀룰로오스물질을 발포시킨 완충단열재의 새로운 제조방법 |
DE10312758A1 (de) | 2003-03-21 | 2004-09-30 | Saueressig Gmbh & Co. | Herstellungsverfahren für absorbierendes Faserprodukt und absorbierendes Faserprodukt |
EP1649103A1 (en) * | 2003-07-16 | 2006-04-26 | FIRA International Limited | Recycling of lignocellulose based board materials |
GB201612889D0 (en) | 2016-07-26 | 2016-09-07 | Natural Resources (2000) Ltd | Moulding of articles |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR873763A (fr) * | 1939-09-20 | 1942-07-20 | Nouveau produit fibreux et procédé de fabrication | |
DE3420195A1 (de) * | 1984-05-30 | 1985-12-12 | Friedrich 2807 Achim Priehs | Verfahren zum herstellen von daemmaterial aus altpapier und/oder pappe |
DE4105245C1 (en) * | 1991-02-20 | 1992-10-22 | Viessmann Werke Gmbh & Co, 3559 Allendorf, De | Rapidly drying moulded bodies - formed by suction on fibrous sludge, placed in enclosed zone at low-pressure |
DE4207233A1 (de) * | 1992-03-07 | 1993-11-18 | Geier Henninger Kurt | Verfahren zur Herstellung von porösen Filterkörpern |
-
1994
- 1994-02-11 DE DE4404322A patent/DE4404322A1/de not_active Withdrawn
-
1995
- 1995-02-07 DE DE59500454T patent/DE59500454D1/de not_active Expired - Fee Related
- 1995-02-07 AT AT95101694T patent/ATE156541T1/de not_active IP Right Cessation
- 1995-02-07 DK DK95101694.8T patent/DK0671504T3/da active
- 1995-02-07 EP EP95101694A patent/EP0671504B1/de not_active Expired - Lifetime
- 1995-02-10 FI FI950589A patent/FI105280B/fi active
- 1995-02-10 CA CA002142222A patent/CA2142222C/en not_active Expired - Fee Related
- 1995-02-10 NO NO950510A patent/NO307191B1/no not_active IP Right Cessation
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11591755B2 (en) | 2015-11-03 | 2023-02-28 | Kimberly-Clark Worldwide, Inc. | Paper tissue with high bulk and low lint |
US11255051B2 (en) | 2017-11-29 | 2022-02-22 | Kimberly-Clark Worldwide, Inc. | Fibrous sheet with improved properties |
US12043963B2 (en) | 2017-11-29 | 2024-07-23 | Kimberly-Clark Worldwide, Inc. | Fibrous sheet with improved properties |
US11313061B2 (en) | 2018-07-25 | 2022-04-26 | Kimberly-Clark Worldwide, Inc. | Process for making three-dimensional foam-laid nonwovens |
US11788221B2 (en) | 2018-07-25 | 2023-10-17 | Kimberly-Clark Worldwide, Inc. | Process for making three-dimensional foam-laid nonwovens |
Also Published As
Publication number | Publication date |
---|---|
EP0671504A1 (de) | 1995-09-13 |
FI950589A0 (fi) | 1995-02-10 |
NO950510L (no) | 1995-08-14 |
NO950510D0 (no) | 1995-02-10 |
DK0671504T3 (da) | 1998-03-02 |
CA2142222A1 (en) | 1995-08-12 |
FI105280B (fi) | 2000-07-14 |
DE59500454D1 (de) | 1997-09-11 |
FI950589A (fi) | 1995-08-12 |
CA2142222C (en) | 2000-11-07 |
ATE156541T1 (de) | 1997-08-15 |
NO307191B1 (no) | 2000-02-21 |
DE4404322A1 (de) | 1995-08-17 |
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