. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. Fig. 2.—Cross Section of Clematis Stem. X 20. (Prepared by the Forest Products Laboratories of Canada.)In this and similar plants, the only parts of value for paper pulp are the bast fibers B,which show as caps fitting on each fibro-vascular bundle F. The parenchyma (pith) cellsP and the cells of the bundles, with the exception of the bast cells, are of little or no Fig. 3.— Cross Section of Stem of Flax Straw. X 20. (Prepared by the Forest Products Laboratories of Canada.)The bast fibers B, which
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. Fig. 2.—Cross Section of Clematis Stem. X 20. (Prepared by the Forest Products Laboratories of Canada.)In this and similar plants, the only parts of value for paper pulp are the bast fibers B,which show as caps fitting on each fibro-vascular bundle F. The parenchyma (pith) cellsP and the cells of the bundles, with the exception of the bast cells, are of little or no Fig. 3.— Cross Section of Stem of Flax Straw. X 20. (Prepared by the Forest Products Laboratories of Canada.)The bast fibers B, which form an almost complete ring just inside the periphery of thestem, are the fibers used in paper making. Inside this is the wide, woody part W of thestem, while the center is hollow. The wood is made up of very short fibers, and is of littleor no value in pulp making. 6 PROPERTIES OF PULP WOOD §] as to make the plants of practically do value in the manufactureof pulp. 6. Structure of Stem of Flax.—Fig. 3 shows the appearanceof the cross section of the stem of flax {Linum usitatissimum);it also illustrates in a general way the structure of hemp, jute,cotton (stalk), and other woody plants. In this class of plant>,the individual bundL - 3 seen in the clematis do not show,because they are so large that they have grown together. Thewhole central part is hollow; and, outside of this, these stemare made up of a wide zone of wood, which is practically t
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
