| 摘要 |
The cement mortar for plasterin by spraying apparatus is composed of the mixture having the ratio of cement to sand, 1:3. The additives comprises 10.4 wt.% EVA as a strengthening agent, 0.1 % methyl cellulose as a moisturizing agent, 0.21 wt.% formaldehyde condensate of naphthalene formaldehyde as a plasticizer, 0.07 wt.% urea formaldehyde resin as a retardant, and 1.77 wt.% calcium carbonate as a thickener. The spraying apparatus comprises (a) the conveyor belt having a vibration motor for transporting sand, (b) the hopper for supplying cement, (c) a continuous spraying tube, (d) the feeder for mixing, kneading, and transporting continuously.
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