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
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.