US3447942A - Preparation of sensitised photographic paper - Google Patents
Preparation of sensitised photographic paper Download PDFInfo
- Publication number
- US3447942A US3447942A US510967A US51096765A US3447942A US 3447942 A US3447942 A US 3447942A US 510967 A US510967 A US 510967A US 51096765 A US51096765 A US 51096765A US 3447942 A US3447942 A US 3447942A
- Authority
- US
- United States
- Prior art keywords
- drums
- web
- photographic paper
- paper
- drum
- 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 - Lifetime
Links
- 238000002360 preparation method Methods 0.000 title description 3
- 239000000839 emulsion Substances 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000007781 pre-processing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 101000619542 Homo sapiens E3 ubiquitin-protein ligase parkin Proteins 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- CODNYICXDISAEA-UHFFFAOYSA-N bromine monochloride Chemical compound BrCl CODNYICXDISAEA-UHFFFAOYSA-N 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 102000045222 parkin Human genes 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- -1 silver halide Chemical class 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
- G03C1/81—Photosensitive materials characterised by the base or auxiliary layers characterised by anticoiling means
Definitions
- Sensitised photographic paper is made by coating a gelatino-silver-halide emulsion on to a strong paper base Web.
- a method of producing sensitive photographic paper which comprises coating one face of a paper web with an aqueous gelatino-silver-halide emulsion, drying the gelatino-silver-halide emulsion coating, and thereafter contacting the other face of the web with at least one smooth surfaced heated drum, the temperature of the drum or drums being between 100 F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the Web and the heated drum or drums being not less than 15 seconds, and thereafter cutting the web to discrete sheet form.
- the preferred method for carrying out this invention comprises coating one face of a paper Web with an aqueous gelatino-silver-halide emulsion, drying the gelatinosilver-halide coating, and then, continuously with the coating, guiding the coated paper web on to one or more 3,447,942 Patented June 3, 1969 smooth metal-surfaced heated drums rotating at a peripheral speed substantially equal to the rate of travel of the webs, so that the other face of the coated paper web contacts the peripheral surface of the said heated drum or drums and is carried around a portion of the circumference of the heated drum or drums in close contact therewith, the temperature of the heated drum or drums being between F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the web and the heated drum or drums being not less than 15 :eeonds and thereafter cutting the web to discrete sheet orm.
- the contact time during which any portion of the web should, for optimum results, be in contact with the heated drum or drums depends on the temperature. For example, if the temperature of the drum or drums is F. a total contact time of about 100 seconds is generally found desirable but if the temperature of the drum or drums is F. only 20 seconds total contact time may be necessary.
- sensitised photographic paper prepared according to this invention, in sheet form in boxes for several months in an atmosphere having a relative humidity of 40% without the sheet material showing any important preprocessing curl when it is removed from the box.
- a method of producing sensitive photographic paper which comprises coating one face of a paper web with an aqueous gelatino-silver-halide emulsion, drying the gelatino-silver-halide emulsion coating, and thereafter contacting the other face of the web with at least one smooth surfaced heated drum, the temperature of the drum or drums being between 100 F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the web and the heated drum or drums being not less than 15 seconds, and thereafter cutting the Web to discrete sheet form.
- a method of producing sensitive photographic paper which comprises coating one face of a paper web with an aqueous gelatino-silver-halide emulsion, drying the gelatino-silver-halide coating, and then, continuously with the coating guiding the coated paper web on to one or more smooth metal-surfaced heated drums rotating at a peripheral speed substantially equal to the rate of travel of the webs, so that the other face of the coated paper web contacts the peripheral surface of the said heated drum or drums and is carried around a portion of the circumference of the heated drum or drums in close contact therewith, the temperature of the heated drum or drums being between 100 F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the web and the heated drum or drums being not less than 15 seconds and, thereafter cutting the web to discrete sheet form.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Paper (AREA)
Description
United States Patent 3,447,942 PREPARATION OF SENSITISED PHOTOGRAPHIC PAPER Albert Edward Harris and Frank R. Tolhurst, Ilford, Essex, England, assignors to Ilford Limited, Ilford, Essex, England, a British company No Drawing. Filed Dec. 1, 1965, Ser. No. 510,967 Claims priority, application Great Britain, Dec. 23, 1964, 52,236/ 64 Int. Cl. G03c l/88; B32b 29/06 US. Cl. 117-4 4 Claims ABSTRACT OF THE DISCLOSURE This invention relates to the preparation of sensitised photographic paper carrying a gelatino silver halide emulsion and in particular to a method of producing such paper with improved curl characteristics.
Sensitised photographic paper is made by coating a gelatino-silver-halide emulsion on to a strong paper base Web. A web of photographic paper after it has been coated with the gelatino-silver-halide emulsion and dried, is normally cut up in to discrete sheets and stored in boxes. Unless very stringent precautions are taken regarding the relative humidity of the atmosphere in which the sheets are to be stored, it is found that when the sheets are removed from the boxes they will exhibit face curl, that is to say the paper will be curled towards the emulsion-coated side. This type of curl is called preprocessing curl and is to be distinguished from the curl usually produced after sheet material has been processed.
It is an object of the present invention to provide a method of producing sensitised photographic paper which reduces or eliminates such preprocessing curl.
According to the present invention there is provided a method of producing sensitive photographic paper which comprises coating one face of a paper web with an aqueous gelatino-silver-halide emulsion, drying the gelatino-silver-halide emulsion coating, and thereafter contacting the other face of the web with at least one smooth surfaced heated drum, the temperature of the drum or drums being between 100 F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the Web and the heated drum or drums being not less than 15 seconds, and thereafter cutting the web to discrete sheet form.
The preferred method for carrying out this invention comprises coating one face of a paper Web with an aqueous gelatino-silver-halide emulsion, drying the gelatinosilver-halide coating, and then, continuously with the coating, guiding the coated paper web on to one or more 3,447,942 Patented June 3, 1969 smooth metal-surfaced heated drums rotating at a peripheral speed substantially equal to the rate of travel of the webs, so that the other face of the coated paper web contacts the peripheral surface of the said heated drum or drums and is carried around a portion of the circumference of the heated drum or drums in close contact therewith, the temperature of the heated drum or drums being between F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the web and the heated drum or drums being not less than 15 :eeonds and thereafter cutting the web to discrete sheet orm.
The contact time during which any portion of the web should, for optimum results, be in contact with the heated drum or drums depends on the temperature. For example, if the temperature of the drum or drums is F. a total contact time of about 100 seconds is generally found desirable but if the temperature of the drum or drums is F. only 20 seconds total contact time may be necessary.
It has been found possible to store sensitised photographic paper, prepared according to this invention, in sheet form in boxes for several months in an atmosphere having a relative humidity of 40% without the sheet material showing any important preprocessing curl when it is removed from the box.
In order to determine if the heating of freshly coated photographic paper to comparatively high temperatures had any deleterious effects on the sensitometric properties of the emulsion freshly coated Ilford Chlorobromide Paper No. 2 (the word Ilford is a registered trademark) was heated to 200 F. for various lengths of time. The table below shows that the sensitometric properties of the emulsion are not adversely affected.
We claim as our invention:
1. A method of producing sensitive photographic paper which comprises coating one face of a paper web with an aqueous gelatino-silver-halide emulsion, drying the gelatino-silver-halide emulsion coating, and thereafter contacting the other face of the web with at least one smooth surfaced heated drum, the temperature of the drum or drums being between 100 F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the web and the heated drum or drums being not less than 15 seconds, and thereafter cutting the Web to discrete sheet form.
2. A method according to claim 1 wherein the drum or drums are metal surfaced.
3. A method according to claim 1 wherein the drum or drums are revolving during the time the paper is in contact with them.
4. A method of producing sensitive photographic paper which comprises coating one face of a paper web with an aqueous gelatino-silver-halide emulsion, drying the gelatino-silver-halide coating, and then, continuously with the coating guiding the coated paper web on to one or more smooth metal-surfaced heated drums rotating at a peripheral speed substantially equal to the rate of travel of the webs, so that the other face of the coated paper web contacts the peripheral surface of the said heated drum or drums and is carried around a portion of the circumference of the heated drum or drums in close contact therewith, the temperature of the heated drum or drums being between 100 F. (37 C.) and 200 F. (93 C.) and the total contact time between any portion of the web and the heated drum or drums being not less than 15 seconds and, thereafter cutting the web to discrete sheet form.
4 References Cited UNITED STATES PATENTS 12/1952 Rose 11734 11/1953 Gray 117-34 12/1958 Gray 11734 1/1942 Van Derhoef et a1. 11734 1/1966 Parkin 11734 US. Cl. X.R.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5223664A GB1062110A (en) | 1964-12-23 | 1964-12-23 | Preparation of sensitised photographic paper |
| GB15271/66A GB1115555A (en) | 1964-12-23 | 1966-04-06 | Preparation of photographic sensitised paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3447942A true US3447942A (en) | 1969-06-03 |
Family
ID=26251174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US510967A Expired - Lifetime US3447942A (en) | 1964-12-23 | 1965-12-01 | Preparation of sensitised photographic paper |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3447942A (en) |
| BE (2) | BE674249A (en) |
| CH (1) | CH450907A (en) |
| DE (1) | DE1547977A1 (en) |
| FR (1) | FR1460500A (en) |
| GB (1) | GB1115555A (en) |
| NL (2) | NL6516854A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2269169A (en) * | 1938-10-25 | 1942-01-06 | Eastman Kodak Co | Process for coating supports |
| US2620285A (en) * | 1948-05-08 | 1952-12-02 | Du Pont | Process for drying photographic emulsions |
| US2659680A (en) * | 1951-04-24 | 1953-11-17 | Eastman Kodak Co | Preparation of photographic paper having good curl characteristics |
| US2865792A (en) * | 1954-12-20 | 1958-12-23 | Eastman Kodak Co | Reduced curl in photographic paper |
| US3227578A (en) * | 1961-10-12 | 1966-01-04 | Eastman Kodak Co | Additives to reduce curl in paper |
-
0
- NL NL132537D patent/NL132537C/xx active
-
1965
- 1965-12-01 US US510967A patent/US3447942A/en not_active Expired - Lifetime
- 1965-12-21 CH CH1763065A patent/CH450907A/en unknown
- 1965-12-22 DE DE1965I0029684 patent/DE1547977A1/en active Pending
- 1965-12-23 BE BE674249A patent/BE674249A/xx unknown
- 1965-12-23 NL NL6516854A patent/NL6516854A/xx unknown
- 1965-12-23 FR FR43551A patent/FR1460500A/en not_active Expired
-
1966
- 1966-04-06 GB GB15271/66A patent/GB1115555A/en not_active Expired
-
1967
- 1967-04-06 BE BE696714A patent/BE696714A/xx unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2269169A (en) * | 1938-10-25 | 1942-01-06 | Eastman Kodak Co | Process for coating supports |
| US2620285A (en) * | 1948-05-08 | 1952-12-02 | Du Pont | Process for drying photographic emulsions |
| US2659680A (en) * | 1951-04-24 | 1953-11-17 | Eastman Kodak Co | Preparation of photographic paper having good curl characteristics |
| US2865792A (en) * | 1954-12-20 | 1958-12-23 | Eastman Kodak Co | Reduced curl in photographic paper |
| US3227578A (en) * | 1961-10-12 | 1966-01-04 | Eastman Kodak Co | Additives to reduce curl in paper |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1460500A (en) | 1966-11-25 |
| NL132537C (en) | |
| GB1115555A (en) | 1968-05-29 |
| CH450907A (en) | 1968-05-15 |
| BE674249A (en) | 1966-06-23 |
| DE1547977A1 (en) | 1970-01-02 |
| NL6516854A (en) | 1966-06-24 |
| BE696714A (en) | 1967-09-18 |
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