Gelatin coated sand core and method of making same
First Claim
1. A method of making a molded article for use in a casting process, comprising:
- a. mixing sand particles with protein and water to effect a coating of protein on the sand particles;
b. drying the protein coated sand particles;
c. blowing the dry, protein coated sand particles without active cooling into a mold;
d. passing steam through the protein coated sand particles to hydrate and melt the protein, thereby forming protein bonds between contiguous sand particles to form a molded article; and
e. passing hot, dry air through the molded article to harden the protein bonds between contiguous sand particles.
3 Assignments
0 Petitions
Accused Products
Abstract
In a method of making a molded article for use in a casting process, sand particles are mixed with protein and water to effect a coating of protein on the sand particles. Then, the protein coated sand particles are dried and blown into a pattern mold to form a molded article without active cooling of the coated sand particles. Steam is then passed through the molded article to hydrate and melt the protein, thereby forming bonds between contiguous sand particles. Finally, hot, dry air is passed through the molded article to harden the protein bonds between the contiguous sand particles. This forms a protein coated sand core for use in casting molten metals.
77 Citations
20 Claims
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1. A method of making a molded article for use in a casting process, comprising:
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a. mixing sand particles with protein and water to effect a coating of protein on the sand particles;
b. drying the protein coated sand particles;
c. blowing the dry, protein coated sand particles without active cooling into a mold;
d. passing steam through the protein coated sand particles to hydrate and melt the protein, thereby forming protein bonds between contiguous sand particles to form a molded article; and
e. passing hot, dry air through the molded article to harden the protein bonds between contiguous sand particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of making a sand core, comprising:
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a. mixing sand particles with gelatin and water while supplying heat, wherein the heat melts the gelatin to effect a coating of gelatin on the sand particles and dries the gelatin coated sand particles;
b. blowing the dry, gelatin coated sand particles without active cooling into a mold;
c. passing steam through the gelatin coated sand particles to hydrate and melt the gelatin, thereby forming gelatin bonds between contiguous sand particles to form a molded article; and
d. passing hot, dry air through the molded article to harden the gelatin bonds between contiguous sand particles. - View Dependent Claims (14)
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15. A method of making a sand core, comprising:
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a. mixing sand particles with gelatin and water to create a mixture;
b. supplying heat to the mixture to effect a coating of gelatin on the sand particles and to dry the water thereby drying the mixture;
c. grinding the mixture thereby making the mixture free flowing;
d. blowing the dry, gelatin coated sand particles into a mold;
e. passing steam through the gelatin coated sand particles to hydrate and melt the gelatin, thereby forming bonds between contiguous sand particles to form a molded article; and
f. passing hot, dry air through the molded article to harden the gelatin bonds between contiguous sand particles. - View Dependent Claims (16)
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17. A method of making a sand core, comprising:
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a. heating sand particles to above 40°
C.;
b. mixing the heated sand particles with gelatin and water, wherein the heated sand particles melt the gelatin thereby coating the sand particles with gelatin;
c. drying the gelatin coated sand particles;
d. blowing the dry, gelatin coated sand particles into a mold;
e. passing steam through the gelatin coated sand particles to hydrate and melt the gelatin, thereby forming gelatin bonds between contiguous sand particles to form a molded article; and
f. passing hot, dry air through the molded article to harden the gelatin bonds between contiguous sand particles. - View Dependent Claims (18)
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19. A method of making a sand core, comprising:
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a. mixing sand particles with protein and water to effect a coating of protein on the sand particles;
b. drying the protein coated sand particles;
c. blowing the dry, protein coated sand particles into a mold;
d. rehydrating the protein coating the sand particles within the mold thereby forming protein bonds between contiguous sand particles to form a molded article; and
e. passing hot, dry air through the molded article to harden the protein bonds between contiguous sand particles. - View Dependent Claims (20)
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Specification