The final purpose of this study is to produce experimentally textile fibers and fabrics colored by using optical interference. First, this paper concerns with the color producing phenomenon and laminating construction of the films colored by optical interference, such as that gives rise to varied hues when light shines on it.
The photo-controllable coloring film, which is compsed of one layer of molecular orientation anisotropic polymer film, and two layers of polarizing films, or one polarizing film and one reflective film, was prepared by lamination.
The following results were obtained :
(1) Many hues emanate from the laminated film when light is transmited through it, or is reflected in it. Furthermore, this color seen changes subtly in according to the angle of view, that is the phenomenon of “iridesence” so-called.
(2) The colored, laminated films can emanate easily objective hues by designing constrution of the materials.
(3) We proposed a new analytical method, which is applicable to absorption spectrum of visible light for colored film, and could prove that method is applicable due to easier procedure inlimited region of wave length.

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In order to provide the basic design information of insulating clothing materials, the effective thermal conductivities in the assembly of wool and PET fibers were measured with Thermolabo II (KES-F7), by changing the volume fraction of fibers with the weight or thickness of the fiber assembly kept constant. The results were studied in relation to the volume fraction of fibers at below 10% and were compared with the calculated values from an empirical formula based on a simple model that included radiative heat transfer and conduction.
Our conclusions may be briefly summarized as follows :
(1) For PET fiber assembly, the effective thermal conductivity is much larger whenfibers are arranged parallel to the direction of heat flow than when they are arranged perpendicular. This can be explained in terms of a large difference of the thermal conductivities of the fiber in the longitudinal and transverse directions. For wool fiber assembly, the thermal conductivity depends only slightly on the fiber arrangements, because of relatively small difference in the longitudinal and transverse in the wool fiber.
(2) For thick fiber assembly of low density, the radiative heat transfer is dominant. When the weight of fiber assembly is kept constant in the constant weight method, the contribution of radiative heat transfer increases in proportion to the thickness of fiber assembly. When the thickness is kept constant in the constant thickness method, the contribution of radiation heat transfer increases with decreasing volume fraction of fibers in the assembly.
(3) The heat transfer depends on the diameter of fiber and becomes less efficientfor finer fibers. This may be ascribed partly to the increase in the surface contact resistance and partly to the increase in the absorption coefficient of fibers.

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