Patent ID: 7531117

Claim:
A method for producing models in layers, comprising: (a) applying a first material in a layer on a building platform wherein the first material comprises a particulate material and a first reactive component; (b) selectively applying a second material to the first layer via a droplet production technique, wherein the second material comprises a second reactive component and a non-reacting carrying agent and calculating a quantity x t of the non-reactive carrier agent to be used in the second material based upon the formula x t = m h ( r p 0 , 0254 ) 2 · v f , d · A b · ρ h , wherein m h is quantity of the first reactive component as determined by the product of the weight of the particulate material of the first material and a desired proportional mass of the first reactive component, r p is a value of resolution in dots per inch of the droplet production technique, ν f,d is a volume of liquid particles in the second material, A b is an area of the layer to recieve the second material, and ρ h is the density of the second reactive component; (c) curing the first and second materials to form a solid; and (d) repeating steps (a) and (b) to achieve a plurality of layers to form a model, wherein the first material is a mixture of at least two components that is at least partially prepared prior to each applying step.