| 摘要 |
<p>PURPOSE: To provide a method wherein a composite film in which a transparent thin film having a required film thickness is laminated, and a transparent thin film having a highly precisely adjusted film thickness from the composite film can be easily manufactured. CONSTITUTION: A base film raw material in which a light-absorbing agent absorbing emitted light is mixed, and a thin, film raw material wherein refraction index after filming differs from that of the base film raw material are prepared. Two raw materials are simultaneously extruded by melting from a combined mouthpiece to make a composite film wherein a thin film 3 is laminated on a base film 2. In that case a surface of the thin film 3 is irradiated by a specific radiating angle with measuring light, and a thickness of the thin film is measured by using interference of reflected lights a-c from the thin film 3. An extruding gap of the combined mouthpiece is adjusted based on the thickness data so that the thickness of the thin film becomes a specific value. Further, when the thin film 3 is manufactured, the extrusion gap of the combined mouthpiece is adjusted so that the thickness of the thin film from a composite film becomes a required value. The thin film 3 is peeled off.</p> |
