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:
Jun. 22, 2021
Filed:
Aug. 21, 2015
Nitto Boseki Co., Ltd., Fukushima, JP;
Takashi Nonaka, Fukushima, JP;
Norio Hirayama, Fukushima, JP;
Kazuaki Minami, Fukushima, JP;
Yosuke Nukui, Fukushima, JP;
Nitto Boseki Co., Ltd., Fukushima, JP;
Abstract
Provided is a method for producing glass fiber, capable of stably performing the spinning of glass fibers without mixing of red crystals in glass fibers. When glass fibers are formed by discharging, from a nozzle tip, a molten glass obtained by melting glass raw materials mixed so as to give a glass composition including, when melted, in relation to the total amount thereof, SiOin a range from 57.0 to 62.0% by mass, AlOin a range from 15.0 to 20.0% by mass, MgO in a range from 7.5 to 12.0% by mass, and CaO in a range from 9.0 to 16.5% by mass, and having a total content of SiO, AlO, MgO and CaO of 98.0% by mass or more, the glass composition includes BO, LiO, or BOand LiO as an additive or additives capable of suppressing the generation of red crystals.