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hydraulic debarker
A hydraulic debarker is a machine removing bark from wooden logs by the use of water under a pressure of 100 psia (6.8 atmospheres) or greater.〔(40CFR429.11(a) ) Accessed 2012-09-13〕 Hydraulic debarking can reduce soil and rock content of bark, but may increase the water content. Debarking water may be recycled after effective settling, but suspended solids may increase wear on high-pressure pumps. Hydraulic debarking has declined where water quality problems have arisen.〔(【引用サイトリンク】title=Western Juniper Debarking Project )〕
==History==
Bark on mature redwood trees of coastal California can vary from 4 to 18 inches in thickness. Redwood bark is thick, stringy and tough; and can cause sawmill machinery to malfunction. Men called peelers removed bark from fallen trees in the woods through the early 20th century, but the process was dangerous and labor intensive.〔Carranco pp.70&71〕 In the mid-20th century hydraulic barkers were built at several large sawmills including the Union Lumber Company at Fort Bragg, California, the Northern Redwood Company at Korbel, and the Pacific Lumber Company at Scotia, California.〔(【引用サイトリンク】title=Scotia Historic Assessment Study )〕 The last was featured in a popular sawmill tour.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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