At the present time
this "deckel-edge" paper is being quite extensively used in high-class
bookwork. In the case of writing papers, as has already been stated in
the description of the beating engines, a vegetable sizing made from
resinous matter is introduced into the paper pulp while it is still in
solution, and mixes with it thoroughly, thus filling more or less
completely the pores of the pulp fibers. This is found sufficient for
all ordinary book-papers, for papers that are to be printed upon in the
usual way, and for the cheapest grades of writing-paper, where the
requirements are not very exacting and where a curtailment of expense is
necessary. For the higher grades of writing-paper, however, a distinctly
separate and additional process is required. These papers while on the
machine in web form are passed through a vat which is called the
size-tub, and which is filled with a liquid sizing made of gelatine from
clippings of the horns, hides, and hoofs of cattle, this gelatine or
glue being mixed with dissolved alum and made fluid in the vat.
Pages:
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128