US3974024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing board of cement-like material reinforced by glass fiber
Assignee: Taiheiyo Cement Corp
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Filing: 1974-03-27
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Granted: 1976-08-10
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Expires: 1994-03-27
Abstract
Abstract This invention relates to a process for continuously producing a dense board of cement-like material reinforced by glass fiber, which comprises (1) preparing a slurry of cement-like material; (2) simultaneously spraying the cement-like slurry and short lengths of glass fiber on a suction conveyor in such a manner that the cement-like slurry stream and the glass fiber stream intersect on the suction conveyor to form a dense mat of an intimate mixture of the two; and (3) dehydrating the mat by pulse-like intermittent suction using one or more suction boxes before the cement-like material begins to set, and to an apparatus used in carrying out the process. This invention further relates to a process for continuously producing a light board of air-dispersed cement-like material reinforced by glass fiber, which comprises (1) preparing a slurry of cement-like material having air dispersed therein; and (2) simultaneously spraying the air-dispersed cement-like slurry and short lengths of glass fiber on a conveyor belt in such a manner that the air-dispersed cement-like slurry stream and the glass fiber stream intersect on the conveyor to form an air-dispersed mat of an intimate mixture of the two, and to an apparatus used in carrying out the process. This invention still further relates to a process for continuously producing a laminated board by overlaying the above produced air-dispersed board on the above produced dense board, and to an apparatus used in carrying out the process.
Inventors
- 👤 Tsuyoshi Yano
- 👤 Kazumasa Ichikawa
- 👤 Takao Take
- 👤 Tetsuro Sasano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:54
CPC Classifications
B; B28; B28B; B28B17/00; B28B17/02; B28B1/00; B28B1/52; B28B1/526; B28B5/00; B28B5/02; B28B5/026; B28B5/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A process for continuously producing a dense board of cement-like material reinforced by glass fibers, said process comprising: preparing a slurry of cement-like material selected from the group consisting of water-curable powdered cement and gypsum having a particle size of 40μ - 200μ; spraying said slurry and glass fibers having a fiber length of 10 mm - 50 mm in an amount of 2 - 30% by weight simultaneously onto a suction conveyor in such a manner that the slurry and the glass fibers intersect on the suction conveyor to form a dense mat of a thickness of 3 - 50 mm having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said suction conveyor; dehydrating said dense mat on said conveyor by pulse-like intermittent suction using at least one suction box before the cement-like material begins to set; and cutting said dehydrated dense mat into predetermined board lengths.
Claim 2
Dependent Claim
153 words
A process for continuously producing a dense board of cement-like material reinforced by glass fibers, said process comprising: preparing a slurry of cement-like material selected from the group consisting of water-curable powdered cement and gypsum having a particle size of 40μ - 200μ; spraying said slurry and glass fibers having a fiber length of 10 mm - 50 mm in an amount of 2 - 30% by weight simultaneously onto a suction conveyor in such a manner that the slurry and the glass fibers intersect on the suction conveyor to form a dense mat of a thickness of 3 - 50 mm having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said suction conveyor; dehydrating said dense mat on said conveyor by pulse-like intermittent suction using at least one suction box before the cement-like material begins to set; and cutting said dehydrated dense mat into predetermined board lengths.
Claim 3
Dependent Claim
133 words
A process for continuously producing a light board of air-dispersed cement-like material reinforced by glass fibers, said process comprising: : preparing a slurry of cement-like material selected from the group consisting of water-soluble powdered cement and gypsum of a particle size of less than 200μ having air dispersed therein; spraying said air-dispersed slurry and glass fibers having a fiber length of 10 - 50 mm in an amount of 0.5 - 5% by weight simultaneously onto a conveyor belt in such a manner that said air-dispersed slurry and said glass fibers intersect on the conveyor to form an air-dispersed mat of a thickness of 20 - 150 mm having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said conveyor; and cutting said air-dispersed mat into predetermined board lengths.
Claim 4
Dependent Claim
133 words
A process for continuously producing a light board of air-dispersed cement-like material reinforced by glass fibers, said process comprising: : preparing a slurry of cement-like material selected from the group consisting of water-soluble powdered cement and gypsum of a particle size of less than 200μ having air dispersed therein; spraying said air-dispersed slurry and glass fibers having a fiber length of 10 - 50 mm in an amount of 0.5 - 5% by weight simultaneously onto a conveyor belt in such a manner that said air-dispersed slurry and said glass fibers intersect on the conveyor to form an air-dispersed mat of a thickness of 20 - 150 mm having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said conveyor; and cutting said air-dispersed mat into predetermined board lengths.
Claim 5
Dependent Claim
312 words
A process for continuously producing a laminated board having a light board of air-dispersed cement-like material reinforced by glass fibers overlaid onto a dense board of cement-like material reinforced by glass fibers, said process comprising: preparing a slurry of cement-like material of a particle size of 40μ - 200μ selected from the group consisting of water-curable powdered cement and gypsum; spraying said slurry and glass fibers having a fiber length of 10 - 50 mm in an amount of 0.5 - 5% by weight simultaneously onto a first suction conveyor in such a manner that the slurry and the glass fibers intersect on said suction conveyor to form a dense first mat of a thickness of 3 - 50 mm having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said suction conveyor; dehydrating said dense mat on said conveyor by pulse-like intermittent suction using at least one suction box before the cement-like material begins to set; transferring said dehydrated mat onto a second conveyor; preparing a slurry of cement-like material of a particle size of less than 200μ selected from the group consisting of water-curable powdered cement and gypsum having air dispersed therein; spraying said air-dispersed slurry and glass fibers having a fiber length of 20 - 50 mm in an amount of 2 - 30% by weight simultaneously onto the said dense first mat, which has been dehydrated and is on said second conveyor, in such a manner that the air-dispersed slurry and said glass fibers intersect on said dense first mat to form a laminated board having an air-dispersed second mat overlaid on said dense first mat, said air-dispersed mat having a thickness of 20 - 150 mm and having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said second conveyor; and cutting said laminated board into predetermined board lengths.
Claim 6
Dependent Claim
312 words
A process for continuously producing a laminated board having a light board of air-dispersed cement-like material reinforced by glass fibers overlaid onto a dense board of cement-like material reinforced by glass fibers, said process comprising: preparing a slurry of cement-like material of a particle size of 40μ - 200μ selected from the group consisting of water-curable powdered cement and gypsum; spraying said slurry and glass fibers having a fiber length of 10 - 50 mm in an amount of 0.5 - 5% by weight simultaneously onto a first suction conveyor in such a manner that the slurry and the glass fibers intersect on said suction conveyor to form a dense first mat of a thickness of 3 - 50 mm having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said suction conveyor; dehydrating said dense mat on said conveyor by pulse-like intermittent suction using at least one suction box before the cement-like material begins to set; transferring said dehydrated mat onto a second conveyor; preparing a slurry of cement-like material of a particle size of less than 200μ selected from the group consisting of water-curable powdered cement and gypsum having air dispersed therein; spraying said air-dispersed slurry and glass fibers having a fiber length of 20 - 50 mm in an amount of 2 - 30% by weight simultaneously onto the said dense first mat, which has been dehydrated and is on said second conveyor, in such a manner that the air-dispersed slurry and said glass fibers intersect on said dense first mat to form a laminated board having an air-dispersed second mat overlaid on said dense first mat, said air-dispersed mat having a thickness of 20 - 150 mm and having said glass fibers intimately disposed substantially two-dimensionally with respect to the surface of said second conveyor; and cutting said laminated board into predetermined board lengths.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |