| 摘要 |
The invention relates to a method of and to an apparatus for ascertaining at least one parameter of cigarette paper or the like, such as a running web of cigarette paper at least one side of which carries or should carry longitudinally spaced-apart coatings, e.g., consisting of silicate or cellulose and suitable to serve as so-called burning or combustion stops. A source of electromagnetic radiation cooperates with a polarizer to direct radiation against one side of the running web at an angle of between about 0° and 75° to the plane of the web at the locus of impingement of radiation. The radiation which has penetrated through the web is measured by a photosensitive detector which transmits corresponding signals to an evaluating arrangement serving to ascertain one or more characteristics of the coatings.
|
