Selection of Business Form Papers Based on Dimensional Stability.

The manifolding of papers in modern business forms, coupled with the interleaving of one time carbon paper between the form elements, requires that each of the paper elements show minimum but equal response to changes in ambient conditions if the forms are to perform satisfactorily in modern business machines, where information struck into the master copy is imprinted onto the other copies through one time or spot carbon in the manifold form. Samples of papers representing the cross machine pattern of a production run of business form paper were obtained. These were tested for their dimensional response to changes in relative humidity. The test data show dimensional stability in its relation to the position of the paper in the paper machine web. From the data a method of selection of papers based on dimensional stability is proposed.