The paper passes and repasses through these
calenders until the requisite degree of smoothness and polish has been
acquired. The friction in this machine produces so much electricity that
ground wires are often used to carry it off in order that the paper may
not become so highly charged as to attract dust or cause the sheets to
cling together. When the fine polish has been imparted, the rolls of
paper go to the cutting machines, which are automatic in action, cutting
regular sheets of the required length as the paper is fed to them in a
continuous web. In the manufacture of some high grades of paper, such as
linens and bonds, where an especially fine, smooth surface is required,
the sheets after being cut are arranged in piles of from twelve to
fifteen sheets, plates of zinc are inserted alternately between them,
and they are subjected to powerful hydraulic pressure. This process is
termed "plating," and is, of course, very much more expensive than the
process of supercalendering described above.
From the cutters, the sheets are carried to the inspectors, who are
seated in a row along an extended board table before two divisions with
partitions ten or twelve inches high, affording spaces for the sheets
before and after sorting.
Pages:
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130