Abstract: The degree of ventilation of ventilation zones in the wrappers of filter cigarettes is ascertained by confining the ventilation zones of successive cigarettes in a chamber during travel through a testing station and by increasing the pressure in the chamber above or by reducing the pressure in the chamber below atmospheric pressure. The pressure at that end of each cigarette which is adjacent the ventilation zone is monitored at the testing station, and the resulting signal is indicative of the degree of ventilation. Such signal can be divided by a signal denoting the pressure in the chamber during testing, and the resulting signal can be multiplied by 100 to obtain a signal which is indicative of the degree of ventilation in percent.

Abstract: A cigarette testing apparatus wherein each end of the wrapper of a cigarette advancing with a rotary conveyor past a testing station receives a stream of gaseous testing fluid from a conduit which is connected with a source of testing fluid, and wherein a further conduit connects the interior of the wrapper at the testing station with an electropneumatic transducer which generates signals denoting the condition of successively tested wrappers.

Abstract: A cigarette testing apparatus wherein each end of the wrapper of a cigarette advancing with a rotary conveyor past a testing station receives a stream of gaseous testing fluid from a conduit which is connected with a source of testing fluid, and wherein a further conduit connects the interior of the wrapper at the testing station with an electropneumatic transducer which generates signals denoting the condition of successively tested wrappers.

Abstract: A cigarette testing apparatus wherein a rotary drum-shaped conveyor has axially parallel peripheral flutes for cigarettes and is flanked by two swash plates which rotate therewith and carry annuli of elastically deformable sealing elements for the respective ends of cigarettes on the conveyor. Each sealing element has a socket facing the adjacent end of the cigarette in the corresponding flutes of the conveyor when the cigarette is inserted into the flutes. The swash plates thereupon move the sealing elements nearer to the ends of the cigarettes therebetween whereby the ends of the cigarettes enter the corresponding sockets and displace transversely extending partitions of the sealing elements with attendant radial contraction of those tubular sections of the sealing elements which surround the respective sockets.