er is secured by theaddition of a sizing material, of either vegetable or animalorigin, which is either applied to the paper as a top coat-ing, or is mixed in with the pulp during the beating pro.^ess.In better grades of writing paper both methods of sizing.3re employed. When the sizing is done in… … a trough or tub in which is a very fluid size made of animalglue and alum. The vegetable size used in the beater is apine sap or resin supplied commercially in the form ofsolid cakes. The function of this resinous sizing is to fillup the interstices of the fibres. The size when thus mixedin and…
Printing
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