Studies on Printing Smoothness Tester (I)

A New Direct Indicating Chapman Printing Smoothness Tester

Abstract

A new printing smoothness tester based on Chapman's principle has been constructed to indicate and record automatically the printing smoothness of paper.
The electronic circuit used in the tester has been designed to utilize the specific feature of the instrument. For example, by reason of the intensity of incident light being not concerned in the smoothness of the paper, simply a fluorescent lamp is used as the source of intermittent light enabling the use of a. c. amplifier in the whole circuit.
On account of the novel design of the circuit, the instruments is superior to any of the existing types of the tester in that the detected signal is not affected by leakage in the detector circuit and its level is very high and also that the operation is stabilized and the construction is materially simplified.
Consideration given to the design of the circuit and a brief account on the printing smoothness of gravure paper are described.