 Carbonaceous fiber reinforced composites |
| The present invention is directed to a composition of a fiber reinforced composite material ... |
|
| Method of producing a friction texturized polyester filament yarn and yarn made thereby |
| OF THE PREFERRED EMBODIMENTS FIG. 1 shows the basic elements of an apparatus 10 for performing the ... |
|
| Settable electronic fuzing system for cannon ammunition |
| It is accordingly an object of the present invention to provide an improved electronic fuzing ... |
|
| Woven fabric having multi-layer structure and composite material comprising the woven fabric |
| It is a primary object of the present invention to provide a woven fabric especially suitable for ... |
|
| High pressure steam deflector for pipes |
| A high pressure steam deflector is provided. The deflector is to be positioned about steam pipes or ... |
|
| Magnetic shielding garment for electro-biologic measurements |
| This invention encompasses a garment for electromagnetically shielding a patient. The shielding ... |
|
| Upper body protector for off-road riders |
| The upper body protector of the instant disclosure is the result of a study by a team composed of ... |
|
| Reusable pressure spray container |
| What is claimed is: 1. A spray bottle for dispensing a liquid product as an aerosol, comprising: (a)... |
|
| Decoder for a software-implemented end-to-end scalable video delivery system |
| In a first embodiment, the present invention provides a software-based, rapidly operating decoder ... |
|
| Magnetic recording medium |
| OF THE PREFERRED EMBODIMENTS The magnetic recording medium according to the present invention ... |
|
|
Woven glass cloth for printed wiring board and printed wiring products manufactured therefrom
| Details |
Inventors: Sakaguchi, Kozo; Nagamine, Fumio; Miyasato, Keita; Hattori, Hiromasa; Watanabe, Tatsuya; Hibino, Akinori;
Assignee: Matsushita Electric Works, Ltd. (Osaka, JP); Nitto Boseki Co., LTd. (Fukushima, JP)
Primary Examiner: Lam; Cathy F.
Assistant Examiner:
Attorney, Agent or Firm: Greenblum & Bernstein P.L.C.
To enhance the tear strength without increasing the thickness, a woven glass cloth having a mass of 15 to 30 g/m.sup.2, for use as a base material for printed wiring board material, is characterized in that the weft or warp is provided by a 75 denier or more strand, thicker than the warp, and thread count of the thicker strand per unit length is set smaller than that of the other strand. |
|
DETAILED DESCRIPTION The present invention has been accomplished in view of these and other issues.
An object of the invention is therefore to provide a woven glass cloth which can be enhanced in tear strength without increasing the thickness.
A further object of the invention is to provide a prepreg, a laminate, and a multilayer printed wiring board all of which can be fabricated without causing tears or breaks by using the woven glass cloth.
According to a first aspect of the present invention, there is provided a woven glass cloth comprising warps and wefts and having a mass of 15 to 30 g/m.
sup.
2, for use as a base material for printed wiring board material, wherein the weft is provided by a 75 denier or more strand, thicker than warp, and that thread count per unit length of strands of the weft is set smaller than that of the warp.
In an preferred embodiment, the thread count per unit length of strands of the weft is 0.
3 to 0.
8 time that of the warp and the weight per unit length of strands of the weft is 1.
5 to 2.
5 times that of the warp.
According to a second aspect of the present invention, there is provided a woven glass cloth comprising warps and wefts and having a mass of 15 to 30 g/m.
sup.
2, for use as a base material for printed wiring board material, characterized in that warp is provided by a 75 denier or more strand, thicker than weft, and that thread count per unit length of strands of the warp is set smaller than that of the weft.
In an preferred embodiment, the thread count per unit length of strands of the warp is 0.
3 to 0.
8 time that of the weft and the weight per unit length of strands of the warp is 1.
5 to 2.
5 times that of the weft.
In another embodiment, at least one of the warp and the weft comprises a two ply yarn or single yarn having a filament diameter of 0.
003 to 0.
010 mm.
According to a third aspect of the present invention, there is provided a prepreg which comprises the woven glass cloth according to the present invention impregnated with resin, wherein the resin is a thermosetting resin
|
|
Manufacturing Materials 
