The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2011
Filed:
Dec. 06, 2004
Eiichiro Yoshikawa, Kobe, JP;
Naoya Fujiwara, Kobe, JP;
Yasuhiro Okamura, Narashino, JP;
Kabushiki Kaisha Kobe Seiko Sho, Hyogo, JP;
Sun Aluminium Industries, Ltd., Chiba, JP;
Abstract
The present invention provides a resin-coated metal plate suitable as a cover plate for use in perforating a printed-wiring board with a drill, capable of effectively preventing the heat generation of drill bits and the scattering of chips while sufficiently performing lubrication and discharging the chips, to highly efficiently form a high-quality perforated-hole with excellent smoothness of the inner wall thereof while reducing the risk of breakage of the drill and eliminating any surface tackiness to achieve excellent operating performance and storage stability. The resin-coated metal plate of the present invention comprising a metal base plate, and a film made of a thermoplastic resin and formed on at least one of the opposite surfaces of said metal base plate to cover thereover, said thermoplastic resin being substantially water-insoluble, wherein said thermoplastic resin has: a melting peak temperature measured according to JIS K7121 ranging from 60° C. to 120° C.; a melt viscosity ranging from 1×10P to 1×10P under a shear rate of 200 mm/sec, and from 5×10P to 5×10P under a shear rate of 3000 mm/sec, in the state when said thermoplastic resin is molten at 150° C.; and a durometer D hardness measured according to JIS K7215 ranging from 20 to 45.