Detection and measurement of cold emulsion adhesives applied to a substrate
AssigneeNordson Corporation
InventorMartin A. Gaon
Life of this patent
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Abstract
An apparatus and method for on line detection and measurement of cold emulsion adhesives, including a sensor of a presence of an adhesive on a substrate, the sensor being arranged to sense an amount of absorption of two specific wavelengths of near infrared energy by the adhesive, the two specific wavelengths including a first wavelength within an absorption band for water and a second wavelength outside an absorption band for water. The two sensed amounts are converted into two signals, a difference between the signals being indicative of the moisture content of the adhesive. If the two signals are the same, then the moisture content approximates zero. Otherwise, the difference is proportional to the moisture content.
Claims17
An apparatus for on line detection and measurement of cold emulsion adhesives on a substrate, comprising:
- a sensor of a presence of an adhesive on a substrate, the sensor being arranged to sense an amount of absorption of two specific wavelengths of near infrared energy by the adhesive, the two specific wavelengths including a first wavelength within an absorption band for water and a second wavelength outside an absorption band for waters,
- a near infrared light source capable of emitting near infrared light,
- a lens assembly configured to focus near infrared light from said near infrared light source at a focal length of said lens assembly and to collect the near infrared light reflected from the substrate for return to the sensor, and
- signal processing electronics configured to continuously determine a quantitative reading of the moisture content from the amount of absorption by the substrate of said first and second wavelengths in the reflected near infrared light collected by said lens assembly and sensed by the sensor.
A method for on line detection and measurement of cold emulsion adhesives on a substrate, comprising:
- focusing near infrared light onto the substrate,
- collecting near infrared light that reflects back from the substrate,
- sensing an amount of absorption of two specific wavelengths of near infrared energy in the reflected near infrared light, the two specific wavelengths including a first wavelength within an absorption band for water and a second wavelength outside an absorption band for water, and
- continuously determining a quantitative reading of the moisture content from the amount of absorption of said first and second wavelengths sensed in the reflected near infrared light collected and sensed.
Dependencies are inferred from the claim text.