Vacuum extrusion system for production of cement-based articles
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United States of America Patent
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Oct 30, 2001
Issued Date -
N/A
app pub date -
Jan 30, 1998
filing date -
Jan 14, 1998
priority date (Note) -
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Abstract
A system for making extruded cement-based articles. The process can include forming a cement-based feed mixture including water, aggregate and binder and directing the feed mixture to a vacuum zone, wherein sufficient vacuum is maintained in the vacuum zone to remove entrained air and, preferably, excess water, from the feed mixture. The feed mixture is held in the vacuum zone at a negative pressure for a time sufficient to form a vacuum-treated or densified mixture. The vacuum-treated or densified mixture is passed through an extruder at an elevated pressure to provide an extruded cement-based article.
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