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nature : paper and cardboard often Size, Rosin and alkali into saponification brown colloid, mixing with hot water or steam injection into cold water emulsion diluted before use. With the use of alkali saponification different time, Rosin contained in the free Rosin volume are different. Usually can be divided into : (a) ordinary plastic (or brown plastic), rosin all or most of saponification, with little or no free rosin; (2) of white plastic, with the volume of free Rosin 25% -40%; (3) A high free rosin, rosin-free 70 % -90%, the latter two Sizing better effect. When used by the first filter, then pulp, and with aluminum sulfate or alum such as precipitant, the fiber compound on precipitation and then copied fabricated and dry water-resistant and should have finished.
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