CS239196B1 - Method of Beaming Beams and Beams - Google Patents
Method of Beaming Beams and Beams Download PDFInfo
- Publication number
- CS239196B1 CS239196B1 CS841321A CS132184A CS239196B1 CS 239196 B1 CS239196 B1 CS 239196B1 CS 841321 A CS841321 A CS 841321A CS 132184 A CS132184 A CS 132184A CS 239196 B1 CS239196 B1 CS 239196B1
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- CS
- Czechoslovakia
- Prior art keywords
- beams
- pressing
- phenol
- adhesive
- wire mesh
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- Adhesives Or Adhesive Processes (AREA)
Abstract
Vynález sa týká sposobu lepenia nosníkov a podvalov s použitím lepidla na bázi fenolu, pričom medzi spojované lamely sa vsunie drótená sieť a takto připravený podval sa zlisuje tlakom 0,3 až 1 MPa po dobu 5 až 15 minút a súčasne so začatím lisovania sa do drotenej siete privedie elektrický prúd o příkone 100 až 300 A o napatí 10 až 24 V, ktorý ju ohřeje po dobu lisovania na teplotu 100 až 200 °C.The invention relates to a method of gluing beams and sleepers using a phenol-based adhesive, whereby a wire mesh is inserted between the joined lamellas and the sleeper thus prepared is pressed under a pressure of 0.3 to 1 MPa for 5 to 15 minutes and simultaneously with the start of pressing, an electric current of 100 to 300 A and a voltage of 10 to 24 V is supplied to the wire mesh, which heats it to a temperature of 100 to 200 °C during the pressing period.
Description
Vynález sa týká sposobu lepenia nosníkov a podvalov s použitím lepidla na bázi fenolu, pričom medzi spojované lamely sa vsunie drótená sieť a takto připravený podval sa zlisuje tlakom 0,3 až 1 MPa po dobu 5 až 15 minút a súčasne so začatím lisovania sa do drotenej siete privedie elektrický prúd o příkone 100 až 300 A o napátí 10 až 24 V, którý ju ohřeje po dobu lisovania na teplotu 100 až 200 °C.
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Vynález sa týká nového spósobu lepenia nosníkov a podvalov pomocou zohriatej dró-; tenej siete. l’ V súčasnosti sa pri výrobě nosníkov na vonkajšiu expozíciu výlučné používá fenolrezorcínové lepidlo FR-63. Spoj vytvořený týmto lepidlom je tmavý, tvrdý a přitom pružný s tepelnou stálosťou do 120 °C, s velmi d-obrou odolnostou voči vodě, rozpúšťadlám a mikroorganizmom. Týmto lepidlom sa lepia aj výhybkové podvaly. Jeho nevýhodou je vysoká cena. ánásobne vyššia ako za fenolové lepidlá a pri jeho výrobě je nutný dovoz jednotlivých komponentov z nesocialistických štátov. Nevýhodou pri použití lepidla FR-!63 je aj dlhý čas vytvrdzovania až 6 hodin.
Uvedené nedostatky lepenia nosníkov a podvalov sú odstránené spósobom podía vynálezu a jeho- podstata spočívá v tom, že na zlepovanú vrchnú, strednú a spodnú lamelu sa nanesie fenolové lepidlo, pričom medzi spojované lamely sa vsunie drótená sieť a takto připravený podval sa zlisuje tlakom 0,3 až 1 MPa po dobu 5 až 15 minút a súčasne so začatím lisovania sa do drótenej siete privedie elektrický prúd o příkone 100 až 300 A o napatí 10 až 24 V, ktorý ju ohřeje po dobu lisovania. na teplotu 100 až 200 °C. Výhoda použitia lepidla na bázi fenolu F 20, ktoré sa používá pri výrobě vodovzdorných preglejok, pri použití na lepenie nosníkov a podvalov, sa prejaví vylúčením zahraničného dovozu komponentov, pričom cena fenolového lepidla je čtvrtinová oproti lepidlu FRJ63. Súčasne sa skráti čas vytvr' dzovaiiia'lepidla F 20 na 10 minút oproti šiestim hodinám pri použití lepidla FR-63.
Na priloženom výkrese je znázorněná skladba podvalu z troch lamiel nanesených fenolovým lepidlom a dvoma drótemými sieťami.
SpĎsob lepenia sa prevádza tak, že, na jednu stranu spodnej lamely 7 a stredovej lamely 4 alebo 1 a 4 sa nanesie lepidlo F 20 na bázi fenolu v množstve 300 g/m2 vo vrstvě 3 a 6. Medzi jednotlivé lamely sá vloží drótená sieť 2 a 5 so šesťstranmými okami, strana oka 8 mm z ocelového drótu prierezu 0 0,63 mm akosti 11 300 podía ČSN 15 3160, táto sieť mierne prečnieva konce podvalu.
Takto připravený podval sa zlisuje tlakom 0,5 MPa a na prečnievajúcu sieť 2 a 5 sa pomocou elektrod privádza elektrický prúd o příkone 180 A o napatí 12 V. Velkost zvoleného lisovacieho tlaku a příkonu elektrického prúdu je závislý od použitého druhu dřevin a dížky (plochy] lepeného nosníka — podvalu. Přechodem elektrického prúdu sa drůtená sieť ohrieva na teplotu 150 °C, pričom výška teploty sa udržiava tyristorovou reguláciou prúdu o výkone 300 V. Po uplynutí ohřevu a vytvrdnutí lepidla (10 minút) sa preruší elektrický obvod a uvolní lisovací tlak. Drótená sieť sa stane súčasťou podvalu alebo nosníka.
BACKGROUND OF THE INVENTION The present invention relates to a method for bonding beams and sleepers using a phenol-based adhesive, wherein a wire mesh is inserted between the bonded lamellae and the so-formed roll is compressed with a pressure of 0.3-1 MPa for 5-15 minutes while crushing is started. the mains supply an electric current of 100 to 300 A at a voltage of 10 to 24 volts, which heats it for a period of pressing to a temperature of 100 to 200 ° C.
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The present invention relates to a new method of gluing beams and beams using heated wire; network. Nowadays, the FR-63 phenol-fluorescence adhesive is exclusively used for the production of external exposure beams. The bond formed by this adhesive is dark, hard and yet flexible with a thermal stability of up to 120 ° C, with very high resistance to water, solvents and microorganisms. This adhesive is also used to bond crossovers. Its disadvantage is the high price. higher than for phenolic adhesives, and it is necessary to import individual components from non-socialist states. The disadvantage of using the FR-63 adhesive is the long curing time of up to 6 hours.
The aforementioned drawbacks of glueing of beams and sleeves are eliminated by the method according to the invention, in that a phenolic glue is applied to the glued top, middle and bottom lamellas, where a wire mesh is inserted between the joined blades and a pressure of 0 is pressed between the blades thus prepared. 3 to 1 MPa for 5 to 15 minutes, and at the same time as the pressing is started, an electrical current of 100 to 300 A is applied to the wire net, with a tension of 10 to 24 V, which heats it for the duration of pressing. at a temperature of 100 to 200 ° C. The advantage of using phenol F 20 based adhesive used in the manufacture of waterproof plywood, when used for bonding beams and beams, is to eliminate foreign imports of components, while the cost of phenolic adhesive is one quarter over that of FRJ63. At the same time, the curing time of the adhesive F 20 is reduced to 10 minutes compared to six hours using the FR-63 adhesive.
In the accompanying drawing, there is shown a composition of a podval of three slats applied by a phenol adhesive and two wire mesh.
The bonding method is carried out by applying a phenol-based adhesive F 20 of 300 g / m 2 in layers 3 and 6 on one side of the bottom lamella 7 and the center lamella 4 or 1 and 4. Between the individual lamellae, the wire net 2 is inserted. and 5 with six-sided eyes, eye side 8 mm of steel wire cross section 0 0.63 mm quality 11 300 according to ČSN 15 3160, this net slightly protrudes over the end of the canter.
The prepared bed is pressed with a pressure of 0.5 MPa and an electric current of 180 A with a voltage of 12 V is applied to the protruding net 2 and 5 by means of electrodes. The size of the selected pressing pressure and electric current input depends on the type of wood used and the length (area By passing the current, the wire mesh is heated to 150 ° C while the temperature is maintained by a thyristor current control of 300V. After heating and curing the adhesive (10 minutes), the electrical circuit is interrupted and the compression pressure is released. The wireframe becomes part of the span or beam.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS841321A CS239196B1 (en) | 1984-02-27 | 1984-02-27 | Method of Beaming Beams and Beams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS841321A CS239196B1 (en) | 1984-02-27 | 1984-02-27 | Method of Beaming Beams and Beams |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS132184A1 CS132184A1 (en) | 1985-05-15 |
| CS239196B1 true CS239196B1 (en) | 1985-12-16 |
Family
ID=5347293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS841321A CS239196B1 (en) | 1984-02-27 | 1984-02-27 | Method of Beaming Beams and Beams |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS239196B1 (en) |
-
1984
- 1984-02-27 CS CS841321A patent/CS239196B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS132184A1 (en) | 1985-05-15 |
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