US4089691A
Expired / Lapsed
US
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Method for manufacturing foundry cores
Assignee: Krause Milling Co
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Filing: 1976-11-12
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Granted: 1978-05-16
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Expires: 1996-11-12
Abstract
Abstract A method for manufacturing a foundry core comprising mixing sand and a binder system containing a saccharide-containing material, glyoxal and an alkali halide.
Inventors
- 👤 Robert G. Cummisford
- 👤 Richard J. Wasielewski
- 👤 Robert K. Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:25
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/02; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/26; C08B; C08B31/00; C08B37/00; C08G; C08G4/00; C08K; C08K3/00; C08K3/16; C08K3/34; C08L1/00; C08L1/02; C08L5/00; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
129 words
A method of manufacturing a foundry core comprising mixing sand and heat-accelerated curable binder system wherein the binder system is produced by the following steps, the percentages being a percent of sand: (a) crosslinking 1-3% of saccharide-containing matter with 0.15-3% of 40% glyoxal aqueous solution; (b) controlling, by accelerating or retarding, the rate of reaction by the use of 0.3-1.0% alkali halide as a catalyst using 0.4% water, 0-10% betonite, 0-10% silica flour, 0-10% iron oxide, and 0-1% of a material selected from the group comprising wax, wax emulsion, asphalt emulsion, and wax-asphalt emulsion, the reaction being at such a temperature and pressure relationship as to maintain a liquid condition during the reaction. (c) forming the mixture to desired shape and causing it to cure to a hardened state.
Claim 2
Independent Claim
129 words
A method of manufacturing a foundry core comprising mixing sand and heat-accelerated curable binder system wherein the binder system is produced by the following steps, the percentages being a percent of sand: (a) crosslinking 1-3% of saccharide-containing matter with 0.15-3% of 40% glyoxal aqueous solution; (b) controlling, by accelerating or retarding, the rate of reaction by the use of 0.3-1.0% alkali halide as a catalyst using 0.4% water, 0-10% betonite, 0-10% silica flour, 0-10% iron oxide, and 0-1% of a material selected from the group comprising wax, wax emulsion, asphalt emulsion, and wax-asphalt emulsion, the reaction being at such a temperature and pressure relationship as to maintain a liquid condition during the reaction. (c) forming the mixture to desired shape and causing it to cure to a hardened state.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1 including the step of curing the core for 5-120 seconds in a hot box.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 2 wherein the hot box is between 250°-550° F.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 1 wherein the saccharide-containing matter is selected from the group comprising sucrose, maltose, corn syrup, corn syrup solids, glyco proteins, hydrolyzed pregelled starches, and hydrolyzed pregelled flours.
Claim 6
Dependent Claim
39 words
A method as claimed in claim 1 wherein the saccharide-containing material is a hydrolyzed-gelatinized amylaceous material having alkaline viscosities of less than 20 seconds using a 1.3 g sample and less than 100 seconds using a 5.2 g sample.
Claim 7
Dependent Claim
25 words
A method as claimed in claim 1 where the alkali halide is selected from the group comprising KCl, KBr, KI, NaCl, NaBr, NaI or NaF.
Claim 8
Dependent Claim
33 words
A method as claimed in claim 1 where the glyoxal solution and alkali halide are admixed with water sufficient to dissolve the alkali halide prior to admixture with the rest of the ingredients.
Claim 9
Dependent Claim
22 words
A method as claimed in claim 7 wherein the alkali halide is selected from the group comprising KCl, NaCl, KBr or NaBr.
Claim 10
Dependent Claim
32 words
A method as claimed in claim 8 wherein the solution of glyoxal and alkali halide with water is in the following range of composition: glyoxal 2-35%, alkali halide 6-25% and water 45-92%.
Claim 11
Dependent Claim
22 words
A method as claimed in claim 1 which includes the step of removing the core from the form and drying the core.
Claim 12
Dependent Claim
32 words
A method as claimed in claim 1 which includes the step of surface coating the core with a material selected from the group comprising water and water-containing core wash prior to drying.
Claim 13
Dependent Claim
15 words
A method as claimed in claim 11 wherein the drying is performed in an oven.
Claim 14
Dependent Claim
17 words
A method as claimed in claim 10 wherein the alkali halide is KCl, KBr, NaCl or NaBr.
Claim 15
Dependent Claim
25 words
A method as claimed in claim 13 wherein the saccharide-containing material is selected from the group comprising sucrose, maltose, corn syrup and corn syrup solids.
Claim 16
Dependent Claim
40 words
A method as claimed in claim 13 wherein the saccharide material is a hydrolyzed gelatinized amylaceous material having alkaline viscosities of less than 20 seconds for a 1.3 g sample and less than 100 seconds for a 5.2 g sample.
Claim 17
Dependent Claim
15 words
A method as claimed in claim 13 wherein the saccharide material is a glyco protein.
Claim 18
Dependent Claim
15 words
A method as claimed in claim 1 wherein the saccharide is water soluble amylaceous hydrolysate.
Claim 19
Dependent Claim
24 words
A method as claimed in claim 13 wherein the glyoxal and alkali halide are mixed prior to admixture with the rest of the ingredients.
Claim 20
Dependent Claim
35 words
A method as claimed in claim 19 wherein the glyoxal and alkali halide are mixed with water in the following range: glyoxal 2-35%, salt 6-25%, water 45-92% prior to adding the rest of the ingredients.
Claim 21
Dependent Claim
29 words
A method as claimed in claim 19 wherein additional water is added at the time of mixing the glyoxal and alkali halide mixture with the rest of the ingredients.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |