By passing paper between rolls on which devices have been cut, the “repped” and other similar papers are produced.
With calender rolls of the ordinary construction, as the pressure is applied at the extreme ends, the roll is liable to assume a slightly curved shape, the effect of which is to produce an uneven surface on the paper, the outer portion of the web being more highly finished than the centre.
FIG. 61.
This defect is obviated to a very large extent by Schurmann’s Patent Anti-Deflection Rolls (Fig. 61). The roll proper consists of an outer shell a, through the centre of which and securely wedged in at b is the centre core c, the ends of which run in journals, and to which pressure is applied in the usual way. The pressure is communicated to the outer shell at the point of contact b, the result being that the parallelism of the surfaces of the rolls is maintained, and in consequence, the paper tends to be equally finished in every direction.
Cutting.
FIG. 62.
FIG. 63.