Nitto Boseki Co., Ltd.

Yasushi Miura

Shin Kasai

Michio Konno

Shoichi Saito

The present invention provides a bushing () having a glass outlet portion () in which two nozzle holes () of substantially flat shape are arranged, and permitting molten glass to be drawn out of the nozzle holes (), and the bushing is provided with a concomitant flow guide () for guiding a concomitant flow made with drawing of the molten glass out of the nozzle holes (), to between the nozzle holes ().

Bushing and glass fiber producing method

A nonwoven fabric is constructed of a highly flat glass fiber which is a glass fiber whose section is flat and has a flatness ratio of 2.0 to 10 and which has such a section that the packing fraction is at least 85%, preferably at least 90%. In this nonwoven fabric, the glass fiber section has a shape near rectangle, and hence, the glass fibers can be arranged very densely to form a thin nonwoven fabric having a high bulk density, and when it is used as a laminate material, the glass fiber content can be increased and the surface smoothness can simultaneously be enhanced and can be used appropriately as a reinforcing material for a printed wiring board. Moreover, the above flat glass fiber can be produced by use of, for example, a nozzle having such a shape that one side of the major axis walls of a nozzle chip having a flat nozzle hole is partly notched.

Growing community of inventors

Fukushima, Japan

Yasushi Miura