Inspection device, PTP packaging machine and inspection method

An inspection device used in manufacture of a Press Through Package (PTP) sheet that comprises a container film including a pocket portion in which a content is placed and a cover film closing the pocket portion, the inspection device comprising:

• an illumination device that irradiates the content with near-infrared light;
• a spectroscope that disperses reflected light from the content irradiated with the near-infrared light;
• an imaging device that takes an image of an optical spectrum of the reflected light dispersed by the spectroscope and acquires spectroscopic image data;
• and
• a controller that:
• comprises a central processing unit (CPU),
• obtains spectral data of the content based on the spectroscopic image data, wherein the spectral data comprises spectral intensities,
• executes an inspection of the content based on the spectral data of the content,
• executes quality judgment of the content by determining whether each of the spectral intensities of the spectral data is within an allowable range of a corresponding spectral intensity in a corresponding wavelength band out of a plurality of wavelength bands included in the spectral data of the content,
• successively stores in time series spectral data of each of a plurality of contents previously inspected and determined as a non-defective product prior to storing the spectral data of the content,
• calculates an average value of the spectral intensities in the corresponding wavelength band based on the stored spectral data of the plurality of contents previously inspected and determined as non-defective products,
• calculates, based on the average value, a reference value used for determining whether each of the spectral intensities of the spectral data of the content is within the allowable range of the corresponding spectral intensity in the corresponding wavelength band, and
• changes, based on the reference value, the allowable range in each corresponding wavelength band.