複写原図用紙の紫外透過特性
1963 年 32 巻 3 号 p. 164-169
詳細
1963 年 32 巻 3 号 p. 164-169
The essential quality demanded of paper used for. originals in diazo copying is the high spectral transmittance in the ultra violet region of 3500_??_4000Å where the sensitivity of diazo paper is the highest. The U. V. transmittance is much influenced by the kinds of pulp and filler as well as the extent of beating. Results of tests made on various kinds of paper are summarized in the following.
(1) U. V. transmittance of pure cellulose (cellophane) is very good.
(2) The factors that affect U. V. transmittance most are lignin and beating. Paper, well beaten and of a small amount of lignin content, has high U. V. transmittace. (3)
Influence of filler differs by the kind of filler. Use of dyestuff makes the spectral trans-mittance selective.
(4) The transmittance at 4000Å of paper obtainable on the market is as follows. Tracing paper: 60_??_65%,
Thin barayta paper: approximately 20%,
Letter paper: approximately 15%.
