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1. 发明专利

JPH03164482A PRODUCTION OF CERAMIC POROUS BODY 失效
公开(公告)号：JPH03164482A
公开(公告)日：1991-07-16
申请号：JP30353789
申请日：1989-11-22
申请人： SHACHIHATA INDUSTRIAL
发明人： TOMINAGA HARUHISA , YOSHIOKA TOSHIKI
IPC分类号： C04B38/06
摘要： PURPOSE:To render nonreactivity with ink and to prevent the degeneration of ink by mixing ceramic powder with specified powder, granulating and molding the mixture gnd sintering the molded body by heating. CONSTITUTION:A mixture of 70-30wt.% ceramic powder of 0.1-10mum particle size, e.g. alumina powder with 30-70wt.% powder of 10-100mum particle size having a lower decomposition temp. than the ceramic powder and the powder shape at ordinary temp., e.g. PE powder is granulated, filled into a metal mold and press-molded under 1,000-2,000kg/cm pressure and the molded body is sintered by heating.

2. 发明专利

JPH01202486A HARD POROUS PRINTING ELEMENT AND PRODUCTION THEREOF 失效
公开(公告)号：JPH01202486A
公开(公告)日：1989-08-15
申请号：JP2693088
申请日：1988-02-08
申请人： SHACHIHATA INDUSTRIAL
发明人： TOMINAGA HARUHISA , ICHIKAWA TAKASHI , YOSHIOKA TOSHIKI
IPC分类号： B41K1/50
摘要： PURPOSE:To obtain an inexpensive hard porous printing element free of distortion of a printing surface and capable of expressing a fine-fibered impression, by providing a porous sintered body of hard particulates to constitute a main body of the printing element, and grinding the printing surface of the main body to obtain a smooth printing surface. CONSTITUTION:A hard porous printing element comprises a main body constituted of a porous sintered body comprising numerous hard particulates, and a printing surface of the main body is ground to be a smooth printing surface. The hard porous printing element is produced by molding the main body from a material comprising an easily soluble substance and hard particulates having a melting point lower than that of the easily soluble substance as main constituents, sintering the molded main body, and eluting the easily soluble substance. An end face of a printing part of the main body thus sintered is ground to be the smooth printing surface on which ground end faces of the hard particulates are exposed. It is general that the hard particulates are particulates of a glass, a ceramic or a metal having an average particle diameter of 20-80mum, and the easily soluble substance is a water-soluble metallic salt, particularly, sodium chloride (which is available inexpensively) ground down to an average particle diameter of 10-80mum.

3. 发明专利

JPH01186370A HARD PRINTING MATERIAL AND MANUFACTURE OF HARD POROUS MATERIAL USED THEREFOR 失效
公开(公告)号：JPH01186370A
公开(公告)日：1989-07-25
申请号：JP1020388
申请日：1988-01-20
申请人： SHACHIHATA INDUSTRIAL
发明人： MIZUTANI TAKESHI , TOMINAGA HARUHISA , YOSHIOKA TOSHIKI
IPC分类号： B43K1/00 , B41K1/50 , B41K1/54
摘要： PURPOSE:To obtain a hard printing material capable of displaying a stabilized printing performance for a long time by pouring ink into a glass powder sintered material having very fine pores formed by elution of an easily soluble material after sintering. CONSTITUTION:A hard porous material used for a hard printing material is manufactured by a method as follows. As easily soluble material, a glass powder of a lower melting point than it, a binder, and a solvent which dissolves the binder and does not dissolve the easily soluble material and mixed in a slurry state, kneaded, dried, and pulverized to form to a powdery material. On the surface of the material, binder film is formed. The powdery material is molded by compression, and sintered, and its surface is worked and thereafter, the easily soluble material is eluted to obtain the hard perforated material. Then, ink is impregnated inside many interconnected very fine pores formed by elution of the easily soluble material after sintering. Therefore, when used as a seal, ink oozes out uniformly on a seal surface, a clear print of the seal can be formed, and the hard porous material has no fear of oxidation like metallic material and is extremely stabilized. Then, a clear printing performance can be maintained semipermanently.

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