| 摘要 |
PROBLEM TO BE SOLVED: To determine existence of an intermediate layer over the whole or a predetermined range of a multilayer preform, to quickly acquire a determination result and to determine also whether or not an upper end part and a lower end part of the intermediate layer are located within an allowable range.SOLUTION: In a multilayer preform inspection method for inspecting existence of an intermediate layer in a multilayer preform having a multilayer structure, stripe-like illumination is applied to the rear of the multilayer preform, the multilayer preform is imaged, and the existence/non-existence of the intermediate layer is determined based on a hue detected from the imaged image. |
