Importance

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Abstract

The method for the electropneumatical testing of the composite wrapper of filter cirgarettes by applying a controlled-flow gas pressure to a cigarette end, comprises a first testing in order to determine the gas permeability of the cigarette along its longitudinal direction, i.e. the gas permeability of the filter and of the tobacco filler, in which the cigarette end opposed to the end to which the gas pressure is applied is maintained open and the outer surface of the tipping band is sealed in a gas tight manner; a second testing in order to determine the gas permeability of the paper wrapper which envelopes the tobacco filler, in which the cigarette end opposed to the end to which the gas pressure is applied is closed in gas tight manner, and the outer surface of the tipping band is sealed in a gas tight manner; a third testing in order to determine the gas permeability of the whole composite wrapper in which the cigarette end opposed to the end to which the gas pressure is applied is closed in a gas tight manner. The signals obtained as a result of the second and third testing are compared with respective levels of acceptability presenting a determined value beyond which a cigarette is not acceptable. The value of acceptability is determined for the second testing as a function of the signal obtained from the first testing, and for the third testing as a function of the signals obtained from the first and second testing.

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First Claim