Fiber reinforced cementitious substrate

• US 4,085,001 A
• Filed: 06/30/1976
• Issued: 04/18/1978
• Est. Priority Date: 07/11/1975
• Status: Expired due to Term

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Kurihara, Hideaki, Ichimura, Hiroshi, Mishima, Kiyotaka, Fukuwatari, Tadashi
• Primary Examiner(s): Pavelko, Thomas P.
• Application Number:
  US05/701,220
• Time in Patent Office: 657 Days
• Field of Search: 106/99, 264/86, 264/333, 162/145, 162/146, 162/147, 162/148, 162/154, 162/156, 162/225
• US Class Current: 162/145
• CPC Class Codes: B28B 1/42 using mixtures containing fibres, e.g. for making sheets by slitting the wound layer
• CPC Class Codes: C04B 14/40 Asbestos
• CPC Class Codes: C04B 14/42 Glass
• CPC Class Codes: C04B 18/24 Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper , cork
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A process for preparing glass fiber-reinforced cement sheets by dewatering a slurry wherein at least one member selected from asbestos, cotton, flax, hemp, wool, or silk fibers is added to the aqueous cement-glass fiber slurry. The sheets so produced have increased bending strengths and improved peeling resistance.

Claims

1. A process for preparing a glass fiber-reinforced cement sheet which comprises dewatering a cement-containing slurry on a wire to form a wet film and winding said wet film on a making roll;

the improvement which comprises utilizing in the process an aqueous, cement-containing slurry having a solid content of from 2-30 wt% and wherein the solid component of said slurry comprises 1 to 10 wt% glass fibers, and at least one member selected from the group consisting of 1 to 10 wt% asbestos and 0.03 to 5 wt% of a specific fiber wherein said specific fiber is selected from the group consisting of cotton, flax, hemp, wools and silk with the remainder cement material.

2. The process for preparing a glass fiber-reinforced cement sheet of claim 1, wherein the solid portion of said slurry comprises 1 to 10 wt.% glass fiber;

1 to 10 wt.% asbestos;

0 to 10 wt.% pulp and 80 to 97 wt.% cement material.

3. The process for preparing a glass fiber-reinforced cement sheet of claim 2, wherein the solid portion of said slurry comprises 2 to 8 wt.% glass fiber;

2 to 5 wt.% asbestos;

1 to 7 wt.% pulp and 80 to 95 wt.% cement material.

4. The process for preparing a glass fiber reinforced cement sheet of claim 3, wherein the total content of asbestos and pulp is in the range of 4 to 10 wt.%.

5. The process for preparing a glass fiber reinforced cement sheet of claim 2, wherein the ratio of glass fiber to asbestos is in the range of 0.6 to 6.

6. The process for preparing a glass fiber reinforced cement sheet of claim 1, wherein the solid component of the slurry comprises 1 to 10 wt.% glass fiber;

0.03 to 5 wt.% of said specific fiber;

3 to 10 wt.% of pulp and 75 to 95.97 wt.% cement material.

7. The process for preparing a glass fiber reinforced cement sheet of claim 6, wherein the solid component of said slurry comprises 2 to 8 wt.% glass fiber;

0.1 to 3 wt.% specific fiber;

3 to 10 wt.% pulp and 79 to 94.9 wt.% cement material.

8. The process for preparing a glass fiber reinforced cement sheet of claim 6, wherein the solid component of said slurry comprises 2 to 8 wt.% glass fiber;

0.2 to 1 wt.% cotton or wool;

3 to 10 wt.% pulp and 81 to 94.8 wt.% cement material.

9. The process for preparing a glass fiber reinforced cement sheet of claim 1, wherein said glass fiber having a length of 3 to 100 mm is used.

10. The process for preparing a glass fiber reinforced cement sheet of claim 9, wherein said glass fiber is a chopped strand having a length of 3 to 100 mm.

11. The process for preparing a glass fiber reinforced cement sheet of claim 1, wherein said slurry is fed to a vat and the solid components in the slurry are sheeted by a wire gauze type cylindrical roll and are transferred on an endless felt as a wet film and the wet film is wound upon a making roll.

12. The process for preparing a glass fiber reinforced cement sheet of claim 11, wherein a part of glass fiber is fed on the endless felt.