EP0785053B1 - Verfahren zur kontinuierlichen Herstellung von Span- oder Faserplatten - Google Patents
Verfahren zur kontinuierlichen Herstellung von Span- oder Faserplatten Download PDFInfo
- Publication number
- EP0785053B1 EP0785053B1 EP97200068A EP97200068A EP0785053B1 EP 0785053 B1 EP0785053 B1 EP 0785053B1 EP 97200068 A EP97200068 A EP 97200068A EP 97200068 A EP97200068 A EP 97200068A EP 0785053 B1 EP0785053 B1 EP 0785053B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suspension
- talc
- chip
- talcum
- process according
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/083—Agents for facilitating separation of moulds from articles
Definitions
- the invention relates to a process for continuous production of chipboard or fiberboard made from lignocellulose Raw materials according to the preamble of claim 1.
- An external release agent in the sense of claim 1 understood a release agent, which is either on the pressing allowances, so the tapes, press plates u. Like., Before pressing is applied. Another way is this external release agent on the two surfaces of the scattered and Apply pre-sealed mat if necessary. Internal release agents are on the other hand release agents that are introduced into the interior of the mat are, so the entire chips and / or fiber material z. B. in Connection to the glue can be added. The usage of these two types of release agent is from Deppe / Ernst “paperback der Spanplattenentechnik ", 3rd edition 1991, p. 60, is known.
- a method according to the preamble is from US 4,131,662 A known.
- the external release agent is called talc directly Powder, d. H. applied dry to the pressing allowances.
- This Procedure is in US 4,131,662 but in many ways described disadvantageously. It is said to be cumbersome and wasteful be and to an uneven distribution of the talc as well lead to damage to health.
- To use the good properties of talc as a releasing agent while eliminating this Disadvantages are proposed in US 4,131,662 A, talc in a stable suspension in a stable emulsion of water and convert to an organic solvent, which then on the pressing allowance is applied. Such a solvent leaves continuously growing residues on the pressing supplements back.
- a process for the continuous production of chip or Fiberboard made from raw materials containing lignocellulose, in which the Raw materials in chip and / or fiber form with an NCO group containing binder glued, formed into a mat and under the influence of heat to the chipboard or fiberboard be pressed, with an external release agent in particular the pressing allowance is applied before pressing is also known from GB 1,148,016.
- the press allowances are with a treated external release agent.
- Organic release agents Substances containing free hydroxyl groups, for example glycerin, ethylene glycol, polyester and polyether.
- Fine-grained Fillers are oxides, carbonates, silicates, sulfates, fine particles Minerals, e.g. B. also talc, clays, expanded mica, diatomaceous earth, etc. suitable.
- surfactants is essential Substance.
- the desired granular structure of the release agent can also be used without a filler achieve. This note as well as the examples given causes in practice the use of a filler was dispensed with and the surface-active substance, in particular Soft soap, used as the actual active ingredient alone has been. This can also be seen in Deppe / Ernst, p. 60.
- the invention has for its object a method according to Show preamble of claim 1 that is easy to handle and in which a disruptive build-up on the press supplements is not he follows.
- the invention is based on the knowledge that this is in the state of the Technology in the production of chipboard also as a filler known talc in its sole use, that is without surface-active substances, becomes the active ingredient and thereby Signs of decomposition and the structure difficult to remove Avoid deposits even if with comparatively increased Press temperatures is worked.
- the invention avoids continue to use an organic release agent and uses the inexpensive mineral talc in an economical way as an active ingredient.
- Talc is also under in its application World viewpoints unproblematic. It even leaves his continuous use without building a covering occurs. With continuous presses there is also a continuous one Cleaning of the press allowances instead. This well-known continuous cleaning, which is available anyway, is sufficient completely to keep the press supplements clean.
- the pressing device can operated with high performance and constant speed become. Production does not have to go through separate cleaning cycles to be interrupted.
- the thickness tolerances to be taken into account the plates can advantageously be kept small, since constant, reproducible, even in continuous operation Conditions exist.
- the application of the talc can done in the usual way, for example by sprinkling, Spray on, roll up or the like.
- the talcum reaches the Pressing allowances, including the various pressing tools, such as sheets, plates, strips or the like and on the other hand also the means of transport for the glued raw material, especially the Belts, rollers, rolls u. Like. To be understood.
- talc in the form of aqueous suspension is applied to the pressing supplements.
- the Suspension of talc in water enables easy Preparation and handling of the suspension.
- the advantages are in economical consumption, while maintaining an even Press allowances are covered.
- Adequate arises Liability on the press allowances. Due to the effects of temperature evaporates the water during the pressing, being advantageous the adhesion of the talc to the press allowances is reduced and at the same time the separating effect is retained. Consequently it is possible to use the known press allowances Cleaning devices to clean without a deposit on builds up the press allowances.
- the use of talc in the form of Suspension has no adverse effect on the other process steps in the manufacture of such Spanoder Fiberboard.
- binders containing NCO groups in particular polymeric diphenylmethane diisocyanate (PMDI) used alone or mixed with polyols can still be advantageous to be used.
- PMDI polymeric diphenylmethane diisocyanate
- Such binders are due to the reaction with the hydroxyl groups of the wood also as a polyurethane binder (PUR) called.
- the talc can be in a proportion of about 5 to 40 wt .-% preferably about 20 wt .-% -, based on the total weight of the Suspension can be used. This is also an economical one Use ensured what was in relation to the already inexpensive Release agent has double effects.
- One with these proportions defined suspension has sufficient stability, is easy to handle and has an excellent separation effect. With high degrees of glueing, one also becomes comparative higher proportion by weight of talc in the suspension choose.
- the suspension is kept in motion during application and thus a foam is formed, which is an even application of talc on the press allowances. It won't only signs of settling are avoided, but the foam is considered Means of transport and used as a distributor to keep the even Order to achieve the press allowances.
- the foaming on the suspension is achieved by stirring or pumping.
- talc as an external release agent Connection with a continuous pressing one with a binder containing chip or NCO groups Insert fiberboard. Then it is possible to use the suspension also apply continuously to the pressing allowances and the Press allowances continuously with known cleaning devices clean off.
- An aqueous suspension of talc is prepared by several approaches can be combined into one batch. For each 40 kg of water with a temperature of about 20 ° C. are added submitted and added 10 kg of talc. The addition of the Talc is carried out in 5 portions of 2 kg one after the other. The talc has a grain size of 30 ⁇ m. The servings are under Use a high-speed mixer in the Water introduced. Then 20 such batches of 50 kg each become the batch united.
- An aqueous suspension of talc is prepared by several approaches can be combined into one batch.
- the addition of the Talc is carried out in 5 portions of 8 kg one after the other.
- the talc has a grain size of 20 ⁇ m.
- the servings are under Use a high-speed mixer in the Water introduced. Then 5 such batches of 200 kg each become the batch united.
- talc It becomes an aqueous suspension of talc in one batch made by 700 kg of water with a temperature of about Submitted 50 ° C and 300 kg of talc is added. The addition the talc is carried out in 6 50 kg portions in succession. The talc has a grain size of 10 ⁇ m.
- the servings are introduced into the water using a paddle stirrer. The paddle stirrer is at the highest possible speed driven.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
Claims (6)
- Verfahren zur kontinuierlichen Herstellung von Span- oder Faserplatten aus lignocellulosehaltigen Rohstoffen, wobei die Rohstoffe in Span- und/oder Faserform mit einem NCO-Gruppen aufweisenden Bindemittel beleimt, zu einer Matte geformt und unter Einwirkung von Wärme zu der Span- oder Faserplatte verpreßt werden, wobei vor der Verpressung Talkum als äußeres Trennmittel insbesondere auf die Preßzulagen, also die Bänder, Preßbleche u. dgl. aufgebracht wird, dadurch gekennzeichnet, daß das Trennmittel Talkum in Form einer Suspension in Wasser, ohne organisches Lösungsmittel aufgebracht wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Talkum in einem Anteil von etwa 5 bis 40 Gew.-% - vorzugsweise etwa 20 Gew.-% -, bezogen auf das Gesamtgewicht der Suspension, eingesetzt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Suspension während des Auftragens in Bewegung gehalten und damit ein Schaum gebildet wird, der einen gleichmäßigen Auftrag des Talkums auf die Preßzulagen ermöglicht.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Talkum mit einer mittleren Korngröße von etwa 10 µm eingesetzt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Suspension während des Aufbringens Wasser hinzugefügt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Span- oder Faserplatte kontinuierlich verpreßt wird und daß die Suspension auf die Preßzulagen kontinuierlich aufgetragen wird.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19601401A DE19601401C1 (de) | 1996-01-16 | 1996-01-16 | Verfahren zur kontinuierlichen Herstellung von Span- oder Faserplatten |
| DE19601401 | 1996-01-16 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0785053A2 EP0785053A2 (de) | 1997-07-23 |
| EP0785053A3 EP0785053A3 (de) | 1999-03-31 |
| EP0785053B1 true EP0785053B1 (de) | 2003-03-19 |
Family
ID=7782901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97200068A Expired - Lifetime EP0785053B1 (de) | 1996-01-16 | 1997-01-10 | Verfahren zur kontinuierlichen Herstellung von Span- oder Faserplatten |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0785053B1 (de) |
| DE (2) | DE19601401C1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007012691B4 (de) * | 2007-03-13 | 2016-05-12 | SWISS KRONO Tec AG | Verfahren zur Herstellung von Platten aus Holzfasern und nach diesem Verfahren hergestellte LDF-, MDF- und HDF-Platten |
| DE102009047764A1 (de) | 2009-12-10 | 2011-06-16 | Evonik Goldschmidt Gmbh | Trennmittel und Verwendung zur Herstellung von Kompositformkörpern |
| AT509199B1 (de) | 2010-02-22 | 2011-07-15 | Mikowitsch Herbert | Verfahren zur herstellung einer pressstoffplatte |
| SE546340C2 (en) * | 2022-02-22 | 2024-10-08 | Ekoligens Ab | Systems and methods for making moulded products from cellulose fibres and moulding agents used in such systems and methods |
| WO2024098154A1 (en) * | 2022-11-11 | 2024-05-16 | Guardian Chemicals Inc. | Polymerization terminating layer for isocyanates utilized during manufacturing of cellulose-based products |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB665673A (en) * | 1944-08-09 | 1952-01-30 | Arthur Ray Welch | Method of and apparatus for making improved wood products |
| AT270189B (de) * | 1966-03-17 | 1969-04-25 | Novopan Gmbh | Verfahren zur Herstellung von Platten oder Formkörpern durch Verpressen, vorzugsweise Heißpressen einer mit Bindemittel versetzten Masse aus Holzspänen, Holzfasern oder aus verholzten Rohstoffen |
| DE2647488A1 (de) * | 1976-10-21 | 1978-04-27 | Basf Ag | Verfahren zur herstellung von spanplatten |
| US4131662A (en) * | 1978-01-03 | 1978-12-26 | Mobay Chemical Corporation | Talc-based external mold release agent for polyurethane foams |
| DE3108537A1 (de) * | 1981-03-06 | 1982-11-04 | Bayer Ag, 5090 Leverkusen | Waessrige isocyanat-emulsionen sowie deren verwendung als bindemittel in einem verfahren zur herstellung von formkoerpern |
| DE3820376A1 (de) | 1988-06-15 | 1989-12-21 | Novopan Gmbh | Verfahren zur herstellung von mehrschichtigen spanplatten |
| US5302330A (en) * | 1993-06-08 | 1994-04-12 | Harold Umansky | Method for the manufacture of waferboard |
-
1996
- 1996-01-16 DE DE19601401A patent/DE19601401C1/de not_active Expired - Fee Related
-
1997
- 1997-01-10 DE DE59709532T patent/DE59709532D1/de not_active Expired - Lifetime
- 1997-01-10 EP EP97200068A patent/EP0785053B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0785053A3 (de) | 1999-03-31 |
| DE19601401C1 (de) | 1997-05-28 |
| DE59709532D1 (de) | 2003-04-24 |
| EP0785053A2 (de) | 1997-07-23 |
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