Method and apparatus for testing the wrappers of cigarettes and the like

Details

Inventors: Reuland, Joachim;
Assignee: Hauni-Werke Korber & Co., KG (Hamburg, DT)
Primary Examiner: Reeves; Robert B.
Assistant Examiner: Rolla; Joseph J.
Attorney, Agent or Firm: Kontler; Peter K., Kurucz; John

A first signal is generated indicative of the gas permeability of the wrapper of the article being tested. A second signal is generated indicative of the porosity of the material of the wrappers of the articles being tested. The first and second signals are processed to form for each article a third signal indicative, to an extent greater than the respective first signal, of the component of the gas permeability of the article not attributable to the porosity of the material of the wrapper. The third signal is compared to a reference signal to determine whether the wrapper of the tested article is defective. The aforementioned second signal is generated by averaging out the gas permeabilities of the wrappers of a number of such articles. In order to generate a second signal not influenced by the marked gas permeability variations encountered when testing defective cigarettes, the gas permeabilities of the wrappers of defective cigarettes are positively excluded from the averaging out involved in the generation of the aforementioned second signal.

DETAILED DESCRIPTION What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.
1.
A method of testing the wrappers of a plurality of cigarettes, cigars, cigarillos, cigarette filters, other rod-shaped smokers' articles, and the like, comprising the steps of generating for each article a first signal indicative of the gas permeability of the wrapper of the article; generating a second signal indicative of the porosity of the material of the wrappers of the articles, processing the first and second signals to form for each article a third signal indicative, to an extent greater than the respective first signal, of the component of the gas permeability of the wrapper of the article not attributable to the porosity of the material of the wrapper; and comparing the third signal to a reference signal to determine whether the wrapper of the tested article is defective, wherein said step of generating said second signal comprises generating said second signal by averaging out the gas permeabilities of the wrappers of a number of such articles.
2.
A method as defined in claim 1, wherein said averaging out of the gas permeabilities of the wrappers of a number of such articles comprises averaging out the values of a plurality of signals having values dependent upon the gas permeabilities of the wrappers of a number of such articles.
3.
A method as defined in claim 1, wherein said averaging out of the gas permeabilities of the wrappers of a number of such articles comprises averaging out the values of a plurality of signals derived from said first signals and having values dependent upon the gas permeabilities of the wrappers of a number of such articles.
4.
A method as defined in claim 1, wherein said averaging out of the gas permeabilities of the wrappers of a number of such articles comprises averaging out the values of the third signals generated for said number of articles.
5.
A method as defined in claim 1, wherein the duration of the second signal is independent of its generation

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