Glass roving cloth and glass-fiber-reinforced resin sheet

Patent metadata

Field	Value
Publication number	US-11959203-B2
Application number	US-202017600712-A
Country	US
Kind code	B2
Filing date	Mar 17, 2020
Priority date	Jul 2, 2019
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

The glass roving cloth includes glass rovings each composed of glass filaments, each having a filament diameter Dt of 9.5 to 30.0 μm, bundled in a number bundled Ft of 400 to 8000 as a warp yarn and glass rovings each composed of glass filaments, each having a filament diameter Dy of 9.5 to 30.0 μm, bundled in a number bundled Fy of 400 to 8000 as weft yarns, wherein the weaving density of the warp yarns and weft yarn is 2.0 to 14.0 yarns/25 mm, the average yarn width of the warp yarn and the weft yarn are each 500 to 8000 μm, the widening rate of the warp yarn and the weft yarn are each 3.0 to 30.0%, the glass occupancy in the warp yarn direction is 90.0 to 106.0%, and the glass occupancy in the weft yarn direction is 75.0 to 99.0%.

First claim

The invention claimed is:

1. A glass roving cloth comprising:
a warp yarn; and
a weft yarn,
the warp yarns being glass rovings each comprising glass filaments, each having a filament diameter Dt in a range of 9.5 to 30.0 μm, bundled in a number bundled Ft in a range of 400 to 8000,
the weft yarns being glass rovings each comprising glass filaments, each having a filament diameter Dy in a range of 9.5 to 30.0 μm, bundled in a number bundled Fy in a range of 400 to 8000, wherein
a weaving density of the warp yarns Wt and a weaving density of the weft yarns Wy are each in a range of 2.0 to 14.0 yarns/25 mm,
a warp yarn average yarn width Bt and a weft yarn average yarn width By are each in a range of 500 to 8000 μm,
a warp yarn widening rate Et (100×Bt/(Dt×Ft)) and a weft yarn widening rate Ey (100×By/(Dy×Fy)) are each in the range of 3.0 to 30.0%,
a glass occupancy in a warp yarn direction Mt (100×Bt/(25000 (μm)/Wt)) is in a range of 90.0 to 106.0%, and
a glass occupancy in a weft yarn direction My (100×By/(25000 (μm)/Wy)) is in a range of 75.0 to 99.0%.

2. The glass roving cloth according to claim 1 , wherein
the Mt is in a range of 98.0 to 105.0%, and
the My is in a range of 80.0 to 98.0%.

3. The glass roving cloth according to claim 1 , wherein a loss on ignition of the glass roving cloth is 0.16 to 0.30%.

4. The glass roving cloth according to claim 1 , wherein the Et and Ey are each in a range of 7.0 to 11.4%.

5. A glass fiber-reinforced resin sheet comprising the glass roving cloth according to claim 1 .

6. The glass fiber-reinforced resin sheet according to claim 5 , wherein a proportion by mass of the glass roving cloth based on a total amount of the glass fiber-reinforced resin sheet is 50.0 to 85.0% by mass.

Assignees

• Nitto Boseki Co Ltd

Inventors

• Nukui Yosuke
• Sakata Junya
• Monma Hideaki

Classifications

• D03D15/267 Primary

  Glass · CPC title

• D02G3/18

  from glass or the like · CPC title

• D02G3/22

  Yarns or threads characterised by constructional features {, e.g. blending, filament/fibre (piecing of yarns or threads D01H15/00)} · CPC title

• D03D13/008

  characterised by weave density or surface weight · CPC title

• D03D15/50

  characterised by the properties of the yarns or threads · CPC title