合成パルプおよびその混抄に関する研究

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In an effort to evaluate the synthetic wood pulp (SWP) derived from high-density polyethylene as a paper-making material, the porosity properties of the handsheets prepared from SWP only and from the blends of SWP and softwood kraft pulp were studied. Scanning electron micrographs show that the SWP fiber consists of partially branched strands or fibrils. This also indicates why SWP fibers have a large number of the small pores on the fiber surface and within the fiber. It was estimated from the mercury penetration curve of SWP handsheet that the volume of the small pores less than ca. 0.5μ in equivalent pore radius (ca. 14 kg/cm^2 in mercury penetration pressure) corresponded to about 37 percent of the volume of SWP fiber component. The blend of SWP fibers having such morphological properties leads to a change in porosity properties of blend-handsheets as well as an improvement in optical properties. The total mercury penetration volume (porosity) increased remarkably with increasing the SWP pulp content. On the other hand, the mercury pressure of blend-handsheets at which maximum penetration occurred was higher than that of wood pulp handsheet. This fact seems to indicate that the neck of interconnected channels within the blend-handsheets becomes narrower than that in wood pulp handsheet in disregard of increase in porosity. By heat-pressing under a pressure of 3.5 kg/cm^2 at temperatures under 130℃. the porosity of blend-handsheet decreased remarkably without reducing the volume of the small pores of SWP fibers. In addition, porosity properties were studied by the air permeation method, and it was found that the permeability coefficient increased with the higher SWP content as a result of increase in number of channels in blend-handsheets.
社団法人日本材料学会の論文
1975-09-15

合成パルプおよびその混抄に関する研究

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