Production
Excelsior is cut from "bolts" (round, halved, quartered, or otherwise split logs) of poplar (for example aspen), pine, spruce or eucalyptus. For evaporative cooler pads, the dominant source is the aspen.
Wood wool can be produced in either horizontal or vertical shredding machines.
A possible further processing option is washing, which removes dust. Wood-wool processing may involve drying to reduce moisture in compliance with local requirements, as in the UK.
Finally, wood wool can be dyed to produce a variety of colored products.
Read more about this topic: Wood Wool
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—Calvin Coolidge (1872–1933)