Methods for making light-weight drainage line units
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United States of America Patent
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Aug 19, 1997
Issued Date -
N/A
app pub date -
Oct 31, 1995
filing date -
Mar 4, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for manufacturing preassembled drainage line units comprises feeding a length of perforated vent pipe along a direction of manufacture longitudinally through a tubular mandrel, feeding a continuous sleeve of netting concentrically over the vent pipe along the direction of manufacture from a front end of the mandrel and continuously supplying quantities of artificial aggregate into the space between the sleeve of netting and the vent pipe. A low friction coating is applied to the inside surface of the mandrel to reduce the surface friction of the artificial aggregate caused by compaction, and to permit high speed manufacture.
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