The Content Of The Inspection During The Production Process Of Gypsum Line Mold

1. Water absorption of gypsum line mold
Theoretically, the amount of water required for a chemical reaction between gypsum and water is 18.6%; In the process of model making, the actual amount of water added is much larger than this value, the purpose is to obtain a certain fluidity of gypsum slurry for pouring, and at the same time to obtain a model with a smooth surface; The excess moisture leaves a lot of pores after drying, making the plaster model absorbent.
Water absorption is an important parameter of gypsum models, which directly affects the billet formation speed during grouting  Gypsum powder is placed in a dry place, do not splash water or turned plaster when using, gypsum bags should be clean, to prevent used gypsum residue or other debris mixed into the bag.
2. Detection of moisture content of gypsum line
Gypsum line moisture content is gypsum line industry and quite important a physical parameter, gypsum line drying must first use the electric blower drying box, under the condition of 40 ° C drying to a constant mass, in order to weigh the weight after drying, the weight before and after drying the gypsum line before and after the ratio calculation with arithmetic mean expression, accurate to 0, 1kg / ㎡, generally speaking, the more gypsum line, the lower the moisture content.