United States Patent (19) Matsui 54 GREEN SAND COMPOSITION FOR CASTING 76 Inventor: Hirofumi Matsui, No. 6-16, 2-chome, Higashi, Shibuya-ku, Tokyo, Japan * Notice: The portion of the term of this patent subsequent to Jan. 30, 1996, has been disclaimed. (21) Appl. No.: 951,800 (22 Filed: Oct. 16, 1978 Related U.S. Application Data 63 Continuation-in-part of Ser. No. 785,312, Apr. 8, 1977, Pat. No. 4,137,085. (30) Foreign Application Priority Data Apr. 8, 1976 JP Japan .................................. 51-40047 51) Int. C.’................................................ B28B 7/34 52 U.S.C. ................................ 106/38.35; 106/38.3; 106/38.5 R; 106/38.6; 106/38.8; 106/68; 106/69; 106/71 58 Field of Search ................... 106/38.3, 38.35, 38.8, 106/38.9, 38.5 R, 38.6, 68, 69, 71, 38.7 (56) References Cited U.S. PATENT DOCUMENTS 1,221,259 4/1917 Woddrop ............................ 106/38.8 1,673,356 6/1928 Hanley ...... ... 106/38.5 3,023,113 2/1962 Barlow .. ... 106/38.8 3,053,671 9/1962 Tobler ................................. 106/38.6 3,086,874 4/1963 Wallace et al. ..................... 106/38.5 3,086,875 4/1963 Wallace et al. ..................... 106/38.5 3,095,310 6/1963 Wallace et al. ..................... 106/38.5 3,445,251 5/1969 Nevins ................................ 106/38.3 3,804,641 4/1974 Lyass et al. ... ... 106/38.35 4,137,085 l/1979 Matsui............................... 106/38.35 g = 2.OO28 11) 4,203,771 (45) "May 20, 1980 FOREIGN PATENT DOCUMENTS 1029809 5/1966 United Kingdom.................... 106/38.9 1293837 10/1972 United Kingdom.................. 106/38.35 OTHER PUBLICATIONS Amer. Colloid Company, "Clay Tech., Part 5”, 11/69. The Brit. Foundryman, vol. 70, Part 9, pp. 241-249 (1977). Felicetta, "Lignin VII, Distribution in Mol. Wt. of Cer tain Lignin Sulfonates', J.A.C.S., vol. 78, No. 9, pp. 1099-1904 (1956). Primary Examiner-Lorenzo B. Hayes Attorney, Agent, or Firm-Fleit & Jacobson 57 ABSTRACT Properties of a green sand for casting composed of siliceous sand, a combination of Na-type and Ca-type bentonite and water can be improved by utilizing sur face activating characteristics of a waste liquor from the pulp manufacturing process. When a pulp cooking waste liquor having a pH of 9 to 13 or a concentrate or powder thereof is incorporated into this green sand, the green strength, the flowability and the packing property are remarkably improved. The used green sand mold has a good disintegrating property and the handling of the return sand is performed very easily, and the tem perature control of the return sand can be remarkably facilitated. Further, when this green sand composition is used, occurrence of such defects as buckles, scabs, sand marks and cuts is effectively prevented. When an alumi num ion or transition metalion is incorporated together with the pulp cooking waste liquor, the foregoing ef. fects are further enhanced. 18 Claims, 2 Drawing Figures pH 13.O
GREEN SAND COMPOSITION FOR CASTING
Jun 17, 2023
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