| 摘要 |
A glue application method and system comprises a continuous paper substrate moving in a downstream direction along a path of travel. Glue is applied to selected portions of the upper surface of the paper substrate. A first direct contact capacitive sensor under the paper substrate upstream of glue application and in direct contact with the under surface of the substrate produces a signal representative of the dielectric constant of the paper substrate. A second direct contact capacitive sensor under the paper substrate downstream of glue application and in direct contact with the under surface of the substrate with glue thereon produces a second signal representative of the dielectric constant of the paper substrate with glue thereon. A control determines differences between the first and second signals thereby indicating that glue has been applied to the paper substrate.
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