Mechanisms of perception of laid lines in Japanese paper
Mechanisms of perception of laid lines in Japanese paper
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DOI：
10.1007/s10086-010-1109-2
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发表时间：
2010-10-01
影响因子：
2.9
通讯作者：
Hasegawa, Satoshi
中科院分区：
文献类型：
--
作者：
Enomae, Toshiharu;Han, Yoon-Hee;Hasegawa, Satoshi
在日本纸上经常可以看到平行线。对于历史文献纸的修复，修复纸与原纸之间的铺设线间隔应一致，以保持外观的和谐。在此前提下，讨论了铺设线的感知机制。在背光下可以很容易地观察到铺设的线条。然而，有几种情况下，铺设的线条在背光下是不可见的，但在漫射反射光下却清晰可见。在短竹夹板的屏幕上形成纸张，只有漫反射光线才能观察到铺设的线条。在这些薄片中，没有纤维质量分布或表面粗糙度与铺设线的周期性相关。另一方面，使用长夹板间距生产的纸张表现出透光不均匀，纤维质量不均匀和表面粗糙度。使用双向低角度照明的显微镜观察揭示了以下机制。在流板形成方法中，纤维在第一层中沿交叉夹板方向强烈定向，而在第二层中，一些纤维在脱水过程中沿夹板之间的间隙旋转并对齐。双向取向的纤维彼此垂直导致反射率的对比被认为是铺设的线。
Laid lines are observed frequently in Japanese paper. For restoration of historic document paper, the laid line intervals should be consistent between the restoration paper and the original paper for harmonized appearance. Considering this prerequisite, the perception mechanisms of the laid lines are discussed. Laid lines can be easily observed against backlight. However, there are several cases where laid lines are not visible against backlight, but are clearly visible with diffuse reflected light. With paper sheets formed on screens with short bamboo splint pitches, laid lines were observed only with diffuse reflected light. Within these sheets, there was no fiber mass distribution or surface roughness that correlated with the periodicity of the laid lines. On the other hand, paper sheets produced using long splint pitches exhibited light transmission unevenness, fiber mass unevenness, and surface roughness. Microscopic observations using two-way low-angle illumination revealed the following mechanism. In the flow sheet-forming method, fibers are oriented strongly in the cross-splint direction in the first layer while some fibers rotate and become aligned along the interspaces between the splints in the second layer during dehydration. Bidirectionally oriented fibers perpendicular to each other result in a contrasting reflectivity perceived as laid lines.