US4104115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making paper from water insoluble alginate fibers and the paper produced
Assignee: Carreras Rothmans Ltd
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Filing: 1977-03-08
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Granted: 1978-08-01
•
Expires: 1997-03-08
Abstract
Abstract A method of manufacturing calcium alginate sheets, without the use of an adhesive binder, by use of a Fourdrinier paper making machine is disclosed. Alginate material in fibrous form is obtained by squirting an aqueous solution of water-soluble alginate via a spinneret into a bath of an inorganic salt, whose cation will react with the alginate to produce a water-insoluble alginate. This fibrous alginate material is then fed into a Fourdrinier machine and formed into a sheet, and the pH value of the fibrous alginate slurry at the screen wire of the machine is at or below 7.0.
Inventors
- 👤 Ronald Ernest Prouse
- 👤 Anthony Alfred West
- 👤 Derek Anthony King
- 👤 Roger Poulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:19
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/28; D21H13/30; D21H13/32; D21H5/00; D21H5/12; D21H5/1227
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
96 words
A method of manufacturing alginate paper without the use or formation of an additional adhesive binder comprising the steps of forming a papermaking stock of raw fibrous water insoluble alginate material, said fibrous water insoluble alginate material being free of surface sodium alginate and being the only fibrous material used in said method, presenting said stock to the screen of the web-forming unit of a paper making machine arranged to form said paper and forming said paper on said machine, the pH value of said stock presented to said screen being at or below pH 7.0.
Claim 2
Independent Claim
96 words
A method of manufacturing alginate paper without the use or formation of an additional adhesive binder comprising the steps of forming a papermaking stock of raw fibrous water insoluble alginate material, said fibrous water insoluble alginate material being free of surface sodium alginate and being the only fibrous material used in said method, presenting said stock to the screen of the web-forming unit of a paper making machine arranged to form said paper and forming said paper on said machine, the pH value of said stock presented to said screen being at or below pH 7.0.
Claim 3
Dependent Claim
41 words
A method as defined in claim 1, wherein said fibrous alginate material is obtained by squirting an aqueous solution of water-soluble alginate into a solution of an inorganic salt whose cation will react with the alginate to produce a water-insoluble alginate.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 1, in which the paper making machine is a Fourdrinier machine.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, in which the alginate material comprises calcium alginate fibres.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 4, in which minor proportion of a filler or solid diluent is incorporated in the paper.
Claim 7
Dependent Claim
25 words
A method as claimed in claim 4, in which there is added to the material of the paper after the screen a surface active agent.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 6, in which the surface active agent is added by impregnation of the formed paper.
Claim 9
Dependent Claim
38 words
A method as claimed in claim 6, in which the surface active agent is a soap formed by reaction of an organic amino compound with a fatty acid, or an alkali salt of a long chain fatty acid.
Claim 10
Dependent Claim
27 words
A method as claimed in claim 6, in which the surface active agent is a sulphonated or sulphated organic compound or an inorganic derivative of such compound.
Claim 11
Dependent Claim
19 words
A method as claimed in claim 6, in which the surface active agent is a cationic surface active agent.
Claim 12
Dependent Claim
18 words
A method as claimed in claim 6, in which the surface active agent is a non-ionic organic compound.
Claim 13
Dependent Claim
19 words
A method as claimed in claim 4, in which colouring material is added to the material of the paper.
Claim 14
Dependent Claim
21 words
A method as claimed in claim 4, in which an aroma producing material is added to the material of the paper.
Claim 15
Dependent Claim
16 words
A method as claimed in claim 4, in which the paper is embossed, creped or crimped.
Claim 16
Dependent Claim
13 words
A method as claimed in claim 4, in which the paper is shredded.
Claim 17
Dependent Claim
30 words
An alginate paper consisting essentially of raw water insoluble alginate fibres which are held together to form the sheet material without the use or formation of an additional adhesive binder.
Claim 18
Dependent Claim
30 words
An alginate paper consisting essentially of raw water insoluble alginate fibres which are held together to form the sheet material without the use or formation of an additional adhesive binder.
Claim 19
Dependent Claim
41 words
An alginate paper as defined in claim 16, wherein said alginate fibres are obtained by squirting an aqueous solution of water-soluble alginate into a solution of an inorganic salt, whose cation will react with the alginate to produce a water-insoluble alginate.
Claim 20
Dependent Claim
16 words
An alginate paper as defined in claim 16, wherein said alginate fibres comprise calcium alginate fibres.
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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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |