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:
May. 15, 1979
Filed:
Jun. 29, 1978
Yasuyuki Yamazaki, Iwakuni, JP;
Susumu Norota, Iwakuni, JP;
Teijin Limited, Osaka, JP;
Abstract
A liner sheet for a magnetic tape cartridge, said sheet being a fibrous sheet containing thermoplastic synthetic fibers with at least those fibers which are in its surface layer being bonded as a result of heat melting, said fibrous sheet having (1) an apparent specific gravity 0.55 to 0.85 time the specific gravity of the polymer constituting the fibers, (2) air permeability expressed by a pressure drop of not more than 200 cm Aq/mm when air is caused to flow at a speed of 10 cm/sec in a direction perpendicular to the surface of the sheet and (3) a thickness of 50 to 300 microns, and said fibrous sheet containing in its structure a lubricant and an antistatic agent dispersed therein. The liner sheet can be produced by interposing a fibrous sheet containing thermoplastic synthetic fibers and having the antistatic agent applied thereto between fibrous sheets containing thermoplastic synthetic fibers and having the lubricant applied thereto, and hot-pressing the resulting laminate to melt-bond at least those fibers which are in the surface layer of the laminate; and has superior abrasion resistance, a high level of a lubricating surface, antistatic properties and the ability to reduce noises which occur during running of a magnetic tape.