. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. iber is prevented. 54. Knife Barkers Wasteful.—The knife barker necessarilycuts away a lot of good wood with the bark, and this is wasted,in that it cannot be used for paper making. The percentage of 40 PREPARATION OF PULPWOOD §2 waste is greater as the diameter of the block is smaller; the lossmay be enormous when the operator is careless, as from 15 to 25%of the fiber in the wood may be wasted. Operating a knifebarker is very dangerous work, particularly when the block isheld against the disk by hand. Fo
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. iber is prevented. 54. Knife Barkers Wasteful.—The knife barker necessarilycuts away a lot of good wood with the bark, and this is wasted,in that it cannot be used for paper making. The percentage of 40 PREPARATION OF PULPWOOD §2 waste is greater as the diameter of the block is smaller; the lossmay be enormous when the operator is careless, as from 15 to 25%of the fiber in the wood may be wasted. Operating a knifebarker is very dangerous work, particularly when the block isheld against the disk by hand. For the foregoing reasons, drumbarkers are preferred in most mills, except for final cleaning,unless the quality of pulp demanded requires the use of thecleanest wood obtainable. 55. Splitters.—When blocks of wood that are too large toenter the grinder pocket or the chipper spout come along theconveyor, they are slid down a chute to a splitter, see Fig. 23,to be split into two or more pieces. After the blocks reach thesplitter, they are stood, end up, on a platform A. The operator. Fig. 23. guides the upper end of the block, and when the steel splittingblade E reaches its maximum height, he lets the upper end of theblock go forward until the block assumes a vertical knife comes down on one end of the block (in the same waythat an ax is brought against the end of a stick of wood) andseparates (splits) the block into two pieces. The split is usuallya clean break; but where a knot runs through the block, it issometimes necessary to pull or chop the two pieces apart. Afterbeing split, the wood is placed on a truck or conveyor. Some splitters are horizontal. Most splitters have an eccentric,as at F, Fig. 23, which is driven by a heavy gear H. In thehorizontal type, a heavy connecting rod is used instead of thelever L. One form of horizontal splitter is operated by a steamcylinder and piston. It is, of course, necessary that the operator look out for hisfingers and fe
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