| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus capable of detecting hot melt adhesive and relatively low temperature aqueous liquid adhesive after applying on base material with a single sensor.SOLUTION: The apparatus includes an adhesive sensor having a photodiode sensitive to infrared radiation at different wavelengths. The adhesive sensor concerned can sense infrared radiation thermally emitted from a sufficiently hot adhesive. Alternatively, the adhesive sensor can sense infrared radiation from first and second near infrared diodes that emit at different wavelengths that are reflected with different intensities from an adhesive that is at a temperature insufficient to emit infrared radiation at an intensity to be readily detectable. A visible light source may be provided for targeting and focusing the adhesive sensor. |
