Valve perforation arrangement
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United States of America Patent
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-
Mar 31, 1987
Grant Date -
N/A
app pub date -
Mar 18, 1985
filing date -
Mar 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A machine and method to operate the machine to provide a plurality of valve-like perforations in the rubber-like backing of a nap mat or carpet by delivering the nap map or carpet to and under a spiked roll. The machine includes a back up roll with grooves therein which prevents grooving of the conveyor belt by the pins or spikes on the spiked roll.
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