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Method for manufacturing mold

  • US 8,186,415 B2
  • Filed: 04/08/2011
  • Issued: 05/29/2012
  • Est. Priority Date: 12/27/2005
  • Status: Expired due to Fees
First Claim
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1. A method for manufacturing a mold, comprising the steps of:

  • (a) expanding a powder mixture containing a water-soluble inorganic salt powder and at least one water-soluble organic polymer powder selected from the group consisting of polyvinyl pyrrolidone, polyvinyl alcohol, polyethylene glycol and a cellulose derivative in a plane on a table to form a layer and then selectively spraying a spray liquid that is free of a binder component and contains at least one selected from the group consisting of a water-miscible organic solvent and water through a nozzle on this powder mixture layer to make a bonding strength among particles of the powder mixture layer in a sprayed region higher than that among particles of the powder mixture layer in an unsprayed region;

    (b) further expanding the powder mixture on the powder mixture layer after spraying and then selectively spraying the spray liquid through the nozzle on this powder mixture layer;

    (c) repeatedly conducting the step (b) over several times to form a mold shaped by the sprayed regions; and

    (d) taking out the mold.

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