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Recoating system for using high viscosity build materials in solid freeform fabrication

  • US 6,656,410 B2
  • Filed: 01/17/2002
  • Issued: 12/02/2003
  • Est. Priority Date: 06/22/2001
  • Status: Expired due to Fees
First Claim
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1. A method of applying a build material in layers in a solid freeform fabrication apparatus, the method comprising the steps of:

  • a) introducing a viscosity modifier in the build material to establish a low viscosity state having a first viscosity value;

    b) applying the build material by the apparatus on a working surface to form a layer of build material while the build material is in the low viscosity state;

    c) transforming the layer of build material from the low viscosity state to a high viscosity state by removing the viscosity modifier, the transformation being of an amount sufficient that when applying another layer of the build material late low viscosity state over the layer of build material in the high viscosity state, the transference of shear stress to the layer of build material in the high viscosity state is substantially prevented; and

    d) solidifying portions of the layer to establish a solidified state of build material forming the layers of the three-dimensional object;

    e) repeating steps b) through d) until said three-dimensional object is formed.

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