发明名称 |
Moulding sand expansion testing - by heating preformed disc above photoelectric barrier |
摘要 |
<p>The expansion behaviour of moulding sand is determined quantitatively by compressing a certain wt. of sand into a certain volume inside a ring. The ring is heated electrically or by a gas ring burner and the time elapsed until a shell of sand spalls off is measured by a photoelectric device.</p> |
申请公布号 |
DE2109594(A1) |
申请公布日期 |
1972.09.14 |
申请号 |
DE19712109594 |
申请日期 |
1971.03.01 |
申请人 |
RITTER H |
发明人 |
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分类号 |
G01N25/16;(IPC1-7):01N33/38 |
主分类号 |
G01N25/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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