GB687808A - An improved duplicating process - Google Patents
An improved duplicating processInfo
- Publication number
- GB687808A GB687808A GB30739/50A GB3073950A GB687808A GB 687808 A GB687808 A GB 687808A GB 30739/50 A GB30739/50 A GB 30739/50A GB 3073950 A GB3073950 A GB 3073950A GB 687808 A GB687808 A GB 687808A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paper
- attapulgite
- sheet
- dec
- organic compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
Abstract
687,808. Coated paper. NATIONAL CASH REGISTER CO. Dec. 18, 1950. [Dec. 22, 1949] No. 30739/50. Drawings to Specification. Class 96. [Also in Group XVI] A paper sheet for use as a copy sheet in a duplicating process (see Group XVI) is coated on one or both sides throughout its surface with a mixture containing finely divided particles, preferably white, of a solid inorganic material capable of acting as an adsorbent for and reacting with an organic compound, such as crystal violet lactone, to form a coloured mark. 20 per cent by weight of starch is cooked in water for 15 minutes at 200 degrees F., and the mass cooled to room temperature ; 1 part of attapulgite is dispersed, by the use of a ball mill or the equivalent, in 3 parts of water ; 4 parts of the attapulgite dispersion is mixed with 1 part of the starch solution to form the final mixture. Instead of attapulgite, there may be used Halloysite, magnesium trisilicate, or sodium aluminium zeolite material. Alternatively the inorganic material may be incorporated in the paper, being incorporated in the paper pulp stock as part of the furnish. In another form, the sheet is sensitised by treating it with a solution of tannic acid and drying it, this being suitable where the organic compound is furric ammonium sulphate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US687808XA | 1949-12-22 | 1949-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB687808A true GB687808A (en) | 1953-02-18 |
Family
ID=22084662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30739/50A Expired GB687808A (en) | 1949-12-22 | 1950-12-18 | An improved duplicating process |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH290913A (en) |
| DE (1) | DE848830C (en) |
| FR (1) | FR1029208A (en) |
| GB (1) | GB687808A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3000298A (en) * | 1956-01-03 | 1961-09-19 | Sherman | Printing by diazotization |
| US3435759A (en) * | 1966-03-02 | 1969-04-01 | Dymo Industries Inc | Duplicating method involving color formation |
-
1950
- 1950-12-07 FR FR1029208D patent/FR1029208A/en not_active Expired
- 1950-12-18 GB GB30739/50A patent/GB687808A/en not_active Expired
- 1950-12-20 DE DEN3292A patent/DE848830C/en not_active Expired
- 1950-12-27 CH CH290913D patent/CH290913A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3000298A (en) * | 1956-01-03 | 1961-09-19 | Sherman | Printing by diazotization |
| US3435759A (en) * | 1966-03-02 | 1969-04-01 | Dymo Industries Inc | Duplicating method involving color formation |
Also Published As
| Publication number | Publication date |
|---|---|
| CH290913A (en) | 1953-05-31 |
| DE848830C (en) | 1952-09-08 |
| FR1029208A (en) | 1953-06-01 |
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