| (19) |
 |
|
(11) |
EP 0 715 935 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.02.1997 Bulletin 1997/09 |
| (43) |
Date of publication A2: |
|
12.06.1996 Bulletin 1996/24 |
| (22) |
Date of filing: 20.07.1995 |
|
| (51) |
International Patent Classification (IPC)6: B27N 7/00 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK FR GB GR IE IT LI LU NL PT SE |
|
Designated Extension States: |
|
LT LV SI |
| (30) |
Priority: |
12.12.1994 ES 9402522
|
| (71) |
Applicant: PATENTES Y NOVEDADES S.L. |
|
E-08010 Barcelona (ES) |
|
| (72) |
Inventor: |
|
- Eek-Vancells, Luis
E-08034 Barcelona (ES)
|
| (74) |
Representative: Curell Sunol, Jorge et al |
|
c/o Dr. Ing. M. Curell Sunol I.I. S.L.
Passeig de Gràcia 65 bis
08008 Barcelona
08008 Barcelona (ES) |
|
| |
|
| (54) |
A process for covering particle board |
(57) The process comprises impregnation of first sheets of paper with a first aqueous
resin having a solids content of 30-60 % of urea-melamine-formaldehyde resin; from
4-10 % of a plasticizer; a surfactant wetting agent; a catalyst, and a mould stripping
agent; impregnation of second sheets of paper with a second aqueous resin having a
solids content of from 30-60 % of urea-melamine-formaldehyde resin; 0-8 % of a plasticizer;
a surfactant wetting agent; a catalyst and a mould stripping agent, this impregnation
until the sheets have a resin solids content of 30-60 % and a volatiles content of
5-7 %; forming an ensemble with a first sheet of paper, a second sheet of paper, a
board, a second sheet of paper and a first sheet of paper; and pressing the ensemble,
the press surface being at a temperature ranging from 130 to 180 °C