Wis. Admin. Code Department of Natural Resources NR 257.31 - Specialized definitions
In addition to the definitions set forth in s. NR 257.03, the following definitions apply to the terms used in this subchapter:
(1) "Ancillary operation" means any operation
which is not a core operation but which is performed on-site following or
preceding the extrusion operation, such as direct chill casting, press or
solution heat treatment, cleaning or etching, degassing, and extrusion press
hydraulic fluid leakage.
(2) "Core
operation" means extrusion die cleaning, any wet scrubber associated with the
die cleaning, dummy block cooling, stationary casting, artificial aging,
annealing, degreasing, and sawing.
(3) "Extrusion die cleaning" means an
operation in which the steel dies used for aluminum extrusion are cleaned by
dipping the dies into a concentrated caustic bath to dissolve the aluminum and
then rinsing the dies with water.
Notes
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