Method for manufacturing mold
First Claim
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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Abstract
A method for manufacturing a mold, including steps of (a) expanding a powder mixture containing a water-soluble inorganic salt powder and a water-soluble organic polymer powder in a plane on a table and then selectively spraying a spray liquid containing at least one selected from 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 in a sprayed region higher than that among particles of the powder mixture 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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Citations
21 Claims
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1. A method for manufacturing a mold, comprising the steps of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for manufacturing a mold, comprising the steps of:
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(a) expanding a powder mixture containing sodium chloride powder, magnesium sulfate powder and polyvinyl pyrrolidone powder 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 ethanol 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 muld. - View Dependent Claims (8, 9)
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10. A method for manufacturing a mold, comprising the steps of:
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(a) expanding a powder mixture containing a water-soluble first inorganic salt powder, a second inorganic salt powder consisting of magnesium sulfate, and a water-soluble organic polymer powder 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; (d) taking out the mold; and (e) heating the mold at a temperature at which the first and second inorganic salts are not fused and above a temperature at which the water-soluble organic polymer is burned out. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for manufacturing a mold, comprising the steps of:
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(a) expanding a powder mixture containing a water-soluble first inorganic salt powder, a water-soluble second inorganic salt powder having a melting point lower than that of the first inorganic salt, and a water-soluble organic polymer powder 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; (d) taking out the mold; and (e) heating the mold at a temperature at which the first inorganic salt is not fused but the second inorganic salt is fused. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification