Hydroset process

A conventional curing process for SLI plates is the hydroset process, which is conducted at low temperature and low humidity for 24 to 72 h. The curing temperature ranges from 25°C to 40°C, and the humidity ranges from 8% to 20% of water. The plates are usually covered by canvas, plastic, or paper to retain their moisture. The hydroset process is usually carried out in an enclosed room where the... 

In the wet process, the clay is masticated in a pug mill to break up lumps and then dispersed with a dispersing aid and water to make a 40 percent solids slip of low viscosity. A hi -speed agitator such as a Cowles dissolver is used for this purpose. Sands are settled out, and then the clay is classified into two size fractions in either a Hydroset-der or a continuous Sharpies or Bird centrifuge. The fine fraction, with sizes of less than 1 pm, is used as a pigment and for paper coating, while the coarser fraction is used as a paper filler. 

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