【発明の名称】砥石

Title:

【発明の名称】砥石

Document Type and Number:

Japanese Patent JPH03502554

Kind Code:

A

Abstract:

The invention relates to a grindstone for production of ground-wood pulp. The grinding surface is formed by grinding grits and a concrete matrix binding together the grits. The matrix comprises a cement mixture, and the hardness of the cement mixture in relation to the grits is so controlled that the grinding surface is self-sharpening during the grinding process. The invention is also concerned with a method for the manufacture of a casting mixture for a grind-stone. The method comprises the steps of mixing together water and a slowhardening, sulphate-resisting low-heat Portland cement mixture, the water/cement ratio being about 0.30 to 0.35; effecting the rheology of the casting mixture by a plasticizing agent instead of excess water; and compacting the mixture by stirring, vibrating, compressing or in some other way.

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Inventors:

Sanden, Fred
Palm Karl-Olov
Nurumi, Toyobo
Keppo, Maruti

Application Number:

JP50056287A

Publication Date:

June 13, 1991

Filing Date:

December 15, 1987

Export Citation:

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Assignee:

Oy Parteck AB

International Classes:

B24D3/12; B24D3/14; B24D3/34; B24D18/00; B24D3/02; C04B14/04; C04B14/38; (IPC1-7): B24D3/02; B24D3/14; C04B14/04; C04B14/38

Domestic Patent References:

JPS5965838A	1984-04-14
JPS564460A	1981-01-17
JPS5550246A	1980-04-11
JPS61143740A	1986-07-01

Attorney, Agent or Firm:

Takehiko Suzue (3 outside)

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