SE452036B - PROCEDURE FOR SHAPING, PREFERRED BENDING, OF HARD FIBER DISC - Google Patents
PROCEDURE FOR SHAPING, PREFERRED BENDING, OF HARD FIBER DISCInfo
- Publication number
- SE452036B SE452036B SE8601453A SE8601453A SE452036B SE 452036 B SE452036 B SE 452036B SE 8601453 A SE8601453 A SE 8601453A SE 8601453 A SE8601453 A SE 8601453A SE 452036 B SE452036 B SE 452036B
- Authority
- SE
- Sweden
- Prior art keywords
- liquid
- water
- shaping
- procedure
- discs
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27H—BENDING WOOD OR SIMILAR MATERIAL; COOPERAGE; MAKING WHEELS FROM WOOD OR SIMILAR MATERIAL
- B27H1/00—Bending wood stock, e.g. boards
-
- 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
- B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/36—Moistening and heating webs to facilitate mechanical deformation and drying deformed webs
-
- 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
- D21J1/10—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
- B29K2711/12—Paper, e.g. cardboard
- B29K2711/126—Impregnated
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Description
15 20 25 30 452 056 kvävgas eller nágon annan inert gas kontinuerligt tillföres. Nitrogen gas or any other inert gas is continuously supplied.
Vid användande av làgtemperaturteknik med uppvärmning till ca l00°C har försök visat att träfiberskivorna kan böjas till önskade radier om skivorna innehåller till- räcklig fukthalt i aktuella böjzoner. Det har dock visat sig ta bade läng tid och är mycket svårt att få vatten att tränga in i skivorna i tillräcklig utsträckning för att man skall uppnå en sä stor fukthalt inuti skivorna son1 är erforderlig för att skivorna ej skall spricka sönder under böjningen. Ändamålet med föreliggande uppfinning är att åstadkomma ett förfarande vid böjning av träfiberskivor av inled- ningsvis nämnt slag, vid vilket ovannämnda nackdelar elimineras. Det för förfarandet enligt uppfinningen väsentligen utmärkande är härvid att till vätskan till- sättes ett alkaliesalt företrädesvis av typ natrium- hydroxid som innefattar dipola molekyler, vilka vid uppvärmning av skivorna medelst högfrekvens till ca BO-l20°C koncentrerar högfrekvensförlusterna till de aktuella böjzonerna pà skivorna under böjning eller formpressning till önskad, förutbestämd form.When using low-temperature technology with heating to approx. 100 ° C, experiments have shown that the wood fiber boards can be bent to the desired radii if the boards contain sufficient moisture content in the current bending zones. However, it has been found to take both a long time and it is very difficult to get water to penetrate into the discs to a sufficient extent to achieve such a high moisture content inside the discs that it is necessary for the discs not to crack during bending. The object of the present invention is to provide a method for bending wood fiber boards of the kind mentioned in the introduction, in which the above-mentioned disadvantages are eliminated. What is essentially characteristic of the process according to the invention is that an alkali metal salt, preferably of the sodium hydroxide type, is added to the liquid, which comprises dipole molecules, which when heating the discs by high frequency to about BO-120 ° C during bending or compression molding to the desired, predetermined shape.
Tack vare uppfinningen erhàlles en för böjning erfor- derlig fukthalt inuti skivorna rycket snabbt. Jämfört med användande av rent vatten ökar penetreringen ca 100 gánger. Vid en kontinuerlig böjningsprocess är en snabb inträngning av fukt i skivorna nödvändig.Thanks to the invention, a moisture content required for bending inside the discs is obtained quickly. Compared with the use of clean water, the penetration increases about 100 times. In a continuous bending process, a rapid penetration of moisture into the boards is necessary.
Uppfinningen beskrives närmare nedan med hjälp av ett föredraget utföringsexempel.The invention is described in more detail below by means of a preferred embodiment.
En plan, av cellulosafibrerf lignin samt härdolja be- stående träfiberskiva som skall formas genom företrä- 10 15 20 25 30 35 452 056 desvis böjning, fuktas under ett första moment pá den eller de zoner av skivan som skall böjas medelst en vätska. Denna vätska appliceras pà lämpligt sätt exempelvis genom penselstrykning, sprutning el dyl pà de plana skivornas ovan- och/eller undersida och innefattar vätmedel, vatten samt ett alkalisalt. Vätmedlet är företrädesvis av typen alkylsulfat och alkalisaltet företrädesvis av typen natriumhydroxid. Kemikaliebland- ningen består lämpligen av ca l-5% alkylsulfatf 80~95% vatten samt 5~20% natriumhydroxid. En lösning som visat sig vara speciellt lämplig kan innefatta l-3% alkyl- sulfat, ca 85% vatten samt 10-l5% natriumhydroxid. Efter applicering av vätskan uppvärmes skivan till ca 80-l20°C medelst vârmeplattor eller liknande kontaktvärme, vär- mestrálning eller medelst högfrekvens, induktionsvärme.A plane, consisting of cellulosic fibrous lignin and hard oil consisting of wood fiber board which is to be formed by preferably bending, is wetted during a first step on the zone or zones of the board which are to be bent by means of a liquid. This liquid is applied in a suitable manner, for example by brush coating, spraying, etc., on the upper and / or lower side of the flat discs and comprises wetting agent, water and an alkali salt. The wetting agent is preferably of the alkyl sulphate type and the alkali metal salt is preferably of the sodium hydroxide type. The chemical mixture suitably consists of about 1-5% alkyl sulfate, 80 ~ 95% water and 5 ~ 20% sodium hydroxide. A solution which has been found to be particularly suitable may comprise 1-3% alkyl sulphate, about 85% water and 10-15% sodium hydroxide. After application of the liquid, the disc is heated to about 80-120 ° C by means of hot plates or similar contact heat, heat radiation or by means of high frequency, induction heat.
Kombinationen alkylsulfat och natriumhydroxid åstadkom- mer hög penetrering av vatten i skivan. Jämfört med rent vatten ökar denna penetrering med upp till l00 gànger.The combination of alkyl sulphate and sodium hydroxide causes high penetration of water into the disc. Compared to clean water, this penetration increases by up to 100 times.
Alkalitillsatsen orsakar en ansvällning av cellulosa- fibrerna, som därvid suger till sig vatten snabbt i kombination med làg ytspänning. Vidare àstadkommes en uppmjukning av lignosulfonsyrorna i träfiberskivan pà samma sätt som vid sulfatkokning. När alkaliet sedan neutraliserats av trâfiberskivans inre: sura ämnen hàrdnar ligninet igen efter böjningsprocessen samt genom uppfuktningen àstadkommes även en koncentrering av högfrekvensenergin om sàdan användes för uppvärmningen.The addition of alkali causes a swelling of the cellulose fibers, which thereby absorbs water quickly in combination with low surface tension. Furthermore, the lignosulphonic acids in the wood fiber board are softened in the same way as with sulphate boiling. When the alkali has then been neutralized by the inner: acidic substances of the wood fiber board, the lignin hardens again after the bending process and the wetting also results in a concentration of the high-frequency energy if used for heating.
Dà trâfiberskivan böjts till önskad form med hjälp av lämpligt yttryck pà skivans ena sida under samtidigt mottryck pá skivans andra sida, kvarhàlles skivan i det böjda läget, tills den avkylts till lämplig temperatur för förhindrande av eventuell áterfjädring. Efter ski~ vans avsvalning och torkning är den hârefter färdig för användning i sitt färdigböjda tillstànd där böjningen eller böjningarna uppvisar samma hàllfasthetsegenskaper som skivan i övrigt.When the fibreboard has been bent to the desired shape by means of a suitable surface pressure on one side of the board under simultaneous back pressure on the other side of the board, the board is kept in the bent position until it has cooled to a suitable temperature to prevent possible resuscitation. After cooling and drying of the disc, it is then ready for use in its pre-bent state where the bend or bends exhibit the same strength properties as the rest of the disc.
Claims (4)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8601453A SE452036B (en) | 1986-03-27 | 1986-03-27 | PROCEDURE FOR SHAPING, PREFERRED BENDING, OF HARD FIBER DISC |
| PCT/SE1987/000159 WO1987005955A1 (en) | 1986-03-27 | 1987-03-27 | Method of shaping, preferably bending, hardened wood fiber boards |
| AU71699/87A AU7169987A (en) | 1986-03-27 | 1987-03-27 | Method of shaping, preferably bending, hardened wood fiber boards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8601453A SE452036B (en) | 1986-03-27 | 1986-03-27 | PROCEDURE FOR SHAPING, PREFERRED BENDING, OF HARD FIBER DISC |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE8601453D0 SE8601453D0 (en) | 1986-03-27 |
| SE8601453L SE8601453L (en) | 1987-09-28 |
| SE452036B true SE452036B (en) | 1987-11-09 |
Family
ID=20364005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8601453A SE452036B (en) | 1986-03-27 | 1986-03-27 | PROCEDURE FOR SHAPING, PREFERRED BENDING, OF HARD FIBER DISC |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU7169987A (en) |
| SE (1) | SE452036B (en) |
| WO (1) | WO1987005955A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2324061B (en) * | 1997-04-10 | 2002-05-08 | Findlay Alice Rosemary | A moulded door skin |
| US6689301B1 (en) | 1997-04-10 | 2004-02-10 | Mdf, Inc. | Method of manufacturing a molded door skin from a wood composite, door skin produced therefrom, and door manufactured therewith |
| GB2364343B (en) * | 1997-04-10 | 2002-05-08 | Mdf Inc | A door |
| GB2340060B (en) | 1998-07-29 | 2003-08-13 | Mdf Inc | Method of manufacturing a molded door skin from a flat wood composite, door skin produced therefrom and door manufactured therewith |
| US8597455B1 (en) | 2009-10-02 | 2013-12-03 | Metacomb, Inc. | Translucent building material comprising corrugated cardboard |
| CN103209811B (en) * | 2010-10-29 | 2015-07-01 | 布瑞沃技术有限公司 | Wetting agents |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2338685A (en) * | 1938-05-16 | 1944-01-04 | Dee Herbert Cyril | Process of bending grainless lignocellulose fiberboard |
| US2595501A (en) * | 1946-07-27 | 1952-05-06 | Allis Chalmers Mfg Co | Method of molding insulating material |
| GB1185441A (en) * | 1968-01-25 | 1970-03-25 | Graham Wilton Jeans | Improvements in and relating to Methods of Making Articles from Fibre Board. |
| US3948708A (en) * | 1973-03-26 | 1976-04-06 | Van Dresser Corporation | Method of forming a panel |
| US4007076A (en) * | 1974-12-30 | 1977-02-08 | Masonite Corporation | Post-press embossing of a consolidated man-made board |
-
1986
- 1986-03-27 SE SE8601453A patent/SE452036B/en not_active IP Right Cessation
-
1987
- 1987-03-27 WO PCT/SE1987/000159 patent/WO1987005955A1/en not_active Application Discontinuation
- 1987-03-27 AU AU71699/87A patent/AU7169987A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1987005955A1 (en) | 1987-10-08 |
| SE8601453D0 (en) | 1986-03-27 |
| AU7169987A (en) | 1987-10-20 |
| SE8601453L (en) | 1987-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
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