RAPID HARDENING CEMENT-BONDED PARTICLEBOA RDS FABRICATED BY INJECTIONWITH CARBON-DIOXIDE

Citation
Mh. Simatupang et C. Habighorst, RAPID HARDENING CEMENT-BONDED PARTICLEBOA RDS FABRICATED BY INJECTIONWITH CARBON-DIOXIDE, Holz als Roh- und Werkstoff, 51(4), 1993, pp. 247-252
Citations number
13
Categorie Soggetti
Materials Science, Paper & Wood
Journal title
ISSN journal
00183768
Volume
51
Issue
4
Year of publication
1993
Pages
247 - 252
Database
ISI
SICI code
0018-3768(1993)51:4<247:RHCPRF>2.0.ZU;2-7
Abstract
Wood particles of spruce and larch were used to fabricate cement parti cleboards by carbon dioxide injection. The press platen have borings t o introduce pressurized carbon dioxide. A seal strip, which also acted as distance bar, was placed between the two press platen in order to avoid loss of carbon dioxide, and to have an even distribution of this gas in the pressed furnish. Vacuum was first of all created, and subs equently pressurized carbon dioxide of 7 bar was introduced. The influ ences of the following parameters on the board properties were examine d: direction of gas injection, injection time, press time, and wood sp ecies. The direction of the gas injection showed no significant influe nce. An injection of one and a half minutes, and a press time of three minutes were sufficient. Boards made of spruce showed better properti es than those made of larch. The bending strength of spruce cement par ticleboards complied the specifications of ISO 8335, however, the thic kness swelling were too high. It can be expected that by using a cemen t of higher strength class the technological properties will be improv ed. In the case of cement particleboards made of larch the density of the boards, and the portion of wood particles should be increased to i mprove the properties. Moreover a cement of higher strength class has to be used. The injection process is environmental friendly, because a bout 86 percent of the carbon dioxide emitted in cement manufacturing is fixed in the fabricated boards.