@article{oai:soar-ir.repo.nii.ac.jp:00017654,
 author = {太田,  久枝},
 journal = {信州大学教養部紀要. 第二部, 自然科学},
 month = {Feb},
 note = {Among various kinds of stuffings in pillows that have been used since the past time, and that have recently been made as newer types, that of buckwheat chaffs is still widely used and has some advantages of its own. The writer of this paper had made investigations into the general, real state of pillows. After that, choosing panya, sponge as well as buckwheat chaffs, rice hulls, and tea-leaves as the materials, the writer has made some experiments of such items as their elasticity, smoothness, conduction of heat, expansion of heat, absorbing of humidity, drying of humidity, the constant degree of humidity, and examination of hysteresis. As to the materials for those experiments, the writer used, as the case may be, all or some of the above-mentioned stuffs. This time the writer was to investigate into outstanding qualities of crushed fragments when a pillow is used. Buckwheat chaffs and rice hulls among others were used as materials for experiments of crushing. As one of the attempts in order to pursue the reasons why buckwheat chaffs as stuffing in a pillow are preferable, the writer tried to examine (a) difficulties of crushing and quantities of crushed fragments, in case that each material is oppressed by the power from the outside, (b) the distinct forms of the fragmsnts when crushed. Thus the writer's intention was through those experiments to proceed towards the solution of subjects on stuffings in pillows. The results are as follows. In case of taking the normal state of a material as a limit, any kind of the materials decreases the quantity of larger fragments by drying of humidity, increases that quantity by absorbing of humidity. When they keep the normal state with the seven percentage absorbing of humidity, buckwheat chaffs increase rapidly the quantity of larger remains. However, when the degree of their absorbing of humidity becomes more than seven percentage, the cost of the quantity slackens. The outstanding qualities of older buckwheat chaffs are similar with those of ordinary buckwheat chaffs. Older buckwheat chaffs increase their fragility, become easy to crush, by drying of humidity. But in general the species of buckwheat chaffs, both older and newer, are hard to crush, high in the ratio of the quantity of larger fragments. And the feels of the crushed materials are soft and flexible. Rice hulls are nearly three times as easy to crush as buckwheat chaffs, and the feels are hard and sore. Tea-leaves have many points of affinity with rice hulls, except that the former increases the quantity of crushed fragments by drying of humidity, and that its feels are soft. As to the forms of crushed fragments, that of rice hulls shows perpendicular cut in crushing. Buckwheat chaffs are crushed up by the process of becoming those fragments of both large and middle sizes, with the forms of either Siberian black kites or asymmetrical quadrilaterals. One fragment of buckwheat chaffs in larger type is more heavy and broader in body. From the generalization of the above-mentioned, it will be demanded that further investigations into anatomical, structural, and chemical constitutions of these two materials should be undertaken., Article, 信州大学教養部紀要. 第二部, 自然科学 1: 41-58(1967)},
 pages = {41--58},
 title = {枕の充填剤の研究（7報）：「材質の粉砕実験とその考察」},
 volume = {1},
 year = {1967}
}