US2864725A - Fluid and system for preparing hydrogen sulfide sensitive tape - Google Patents

Fluid and system for preparing hydrogen sulfide sensitive tape Download PDF

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US2864725A
US2864725A US604169A US60416956A US2864725A US 2864725 A US2864725 A US 2864725A US 604169 A US604169 A US 604169A US 60416956 A US60416956 A US 60416956A US 2864725 A US2864725 A US 2864725A
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tape
gelatin
hydrogen sulfide
coating
solution
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US604169A
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Leonard V Sorg
Offutt Elmer Bradley
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Standard Oil Co
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Standard Oil Co
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/8483Investigating reagent band
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00Chemistry: analytical and immunological testing
    • Y10T436/18Sulfur containing
    • Y10T436/182Organic or sulfhydryl containing [e.g., mercaptan, hydrogen, sulfide, etc.]
    • Y10T436/184Only hydrogen sulfide

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  • This invention relates to the continuous treatment of strip material and, in particular, comprises improved apparatus for sensitizing one coated surface of tape or other strip material.
  • the manufacture of our sensitive film includes the steps of applying a liquid sensitive gelatin coating on a film support such as a continuous transparent and fluidimpervious tape. Subsequently, the coated tape is sensitized by impregnating the gelatin with a reactive solution.
  • An important object of the invention is to provide an improved apparatus for continuously feeding tape or other strip material over a treating solution to effect a controlled impregnation of a gelatin coating thereon.
  • a further object of the invention is to provide an apparatus for the rapid, accurate and uniform treatment of the gelatin coating without injury or mutilation of the base strip material.
  • a more specific object of the invention is to provide an apparatus which prevents the sensitized or gelatin side of the tape from coming in contact with the parts of the apparatus along which it moves to permit the use of relatively small amounts of treating solution, to provide means for maintaining the surface of the solution at a constant level, and to maintain the solution at the desired temperature.
  • Another object of the invention is to provide a system utilizing a sensitizing station and a drying chamber with means for feeding the supporting tape through the station and chamber in series so that the tape will be maintained in such a position that the sensitized gelatin coating is dried without contacting any portion of the apparatus.
  • Still another object is to provide'a system which controls the temperature and circulates air in the drying chamber whereby there is a progressive drying of the coating to produce a non-tacky sensitized strip.
  • Figure 1 is an elevation, partly in section, showing one form of apparatus for impregnating a gelating coating on a continuous support and for drying the impregnated coating;
  • Figure 2 is a side elevation, partly in section, of the apparatus shown in Figure 1;
  • Figure 2a is an enlarged fragmentary'section of the trough
  • FIG. 3 is a detail taken along the lines 33 in Figure 1; I
  • Figure 4 is a detail taken along the lines 4-4 in Figure 1;
  • FIG. 5 is a detail taken along the lines 5-5 in Figure 1;
  • Figure 6 is a detail taken along the lines 6-6 in Figure 3.
  • Figure 7 is a detail taken along the lines 77 in Figure '2.
  • the framework comprising angle irons, supports 0.25 inch aluminum panel 11 upon which all of the components of our apparatus are mounted.
  • Four bolts or feet 12 extending through the lateral surfaces of the angle irons 10 permit adjusting the apparatus to a level position.
  • a compartment 13 comprised of walls 13a and hinged cover 14 comprises the drying chamber.
  • a motor 15, controlled by switch 16 and fused by 17, provides the drive for moving the filmor tape through Gears 18 and 19 driven by motor 15 drive sprocket 20 and take-up reel 21 through a friction clutch 22 driven through belt 27.
  • An idler 23 presses the film into engagement with sprocket 20 thereby pre venting tape slippage. Tension is given to the idler 23 through pivoted arm 24 which is under tension from spring 25 attached-to lever 26.
  • Electric heater 30 furnishes heat to control the temperature of the cabinet 13 to a constant value and motor 28 drives the squirrel cage blower 29 which circulates air through the drying compartment 13 about baffie 13b.
  • the heater 30 is shown in Figure 1, but for simplicity has been omitted from Figure 2. Radiating fins 31 and 32 are attached to heater 30 to aid in conduction of the heat.
  • the temperature within the drying chamber 13 is maintained constant by thermal regulator 33 and the temperature is indicated by thermometer 34.
  • the treating or impregnating station 35 includes the trough 36 within constant temperature bath 37.
  • the trough 36 is provided with parallel knife edges 38 and 38a which act like a ruling pen (see Figure 2a) permitting a 0.375 inch trace of chemicals to be impregnated in the gelatin coating on the tape 39. Excess liquid is removed from the gelatin surface by transverse scraper 40.
  • the constant temperature bath 37 comprises an aluminum block and the temperature is maintained constant by strip heaters 41 and 42 which are controlled by thermal regulator 43, electrical power being brought to the heating elements by lead 44. Pilot li ht 45 indicates when the current is on. Power is furnished to motor 28 and heaters 30, 41 and 42 through switch 46, the circuit being fused through 47.
  • Film or tape 39 from the supply reel 43 passes over rollers 49 and 50 which maintain tension on sprocket 51.
  • the supply reel 48 is maintained against a felt brake 52 shown in Figures 3 and 6 and the brake 52 is actuated through lever 53 to which is attached bearing 54.
  • drum 56 which is held against brake pad 52 by spring 57 which is anchored by pin 58.
  • the film supply reel 48 is held onto shaft 55 by clamp 59.
  • lever arm 53 is supported 1 3 by the panel 11.
  • Shaft 55a is held in socket 60 which is fastened to panel 11.
  • a bearing surface for shaft 55a is provided by collar 61, the whole assembly being held onto the shaft 55a by pin 62.
  • Sprocket 51 furnishes additional braking action against the tape 39 from pulley 63, Figures 2 and 7, on which rides a small section of round leather belting 64 with tension applied by spring 65 which is anchored by pin 66. All of these wheel-like mechanisms are supported to the panel 11 by individual bearing members as shown in Figure 2.
  • Guide rollers 66 and 67 carry the tape 39 parallel to the exposed upper surface of the impregnation trough 36 and allow the trough 36 to be vertically adjusted so that the gelatin-coatedsurface of, the tape 39 moves over the liquid surface in the trough 36.
  • the impregnating solution is retained in leveling bottle 69 provided with a tube connection 70 which permits the solution to flow through the plastic tubing 71 into trough 36.
  • the liquid level in trough 36 is raised or lowered by positioning bottle 69 along the threaded rod 72 by collar 73, which supports bottle clamp 74, the selected position being secured by nut 75.
  • the coating station 35 including the trough 36 and the constant temperature bath 37, is adjusted by plate 76 which is fastened to platform 77 by knurled nuts 78 and 79. Loosening the knurled nuts 78 and 79 permits plate 76 to be positioned with respect to panel 11 through slots therein.
  • the entire trough assembly 35, plate 76 and platform 77 rest on steel ball 82 which in turn operates in socket 83 inplatform 77 and lower socket 84 in sub-platform 85. Stud bolts 86 and knurled nuts 87 secure the platform 77 and the sub-platform 85 together to clamp the steel ball 82 therebetween. Adjustments can be made so as to level the trough assembly 35 and to dispose the trough 36 with respect to the panel 11 and the path of travel of the tape 39 to obtain the desired contact of the gelatin coating with the liquid surface in the trough 36.
  • Platform 77 and sub-platform 85 are triangular sections, the apex of the triangular facing the viewer.
  • a threaded shaft 89 passing through support collar 90 which is rigidly secured to panel 11.
  • the unsensitized film is drawn from supply reel 48 through sprocket assembly 49, 50, 51 over roller 67 along knife edges 38 and 38a and under rollers 68 and 94, the excess solution being removed from the gelatin coating ,by scraper 40.
  • the gelatin coating on the tape 39 After the gelatin coating on the tape 39 has been impregnated with the desired chemicals it passes over positioning roller 66 and enters the drying chamber 13 through the port 95. Time for drying the coating is obtained by passing the slowly moving film over positioning rollers 96, 97, 98, 99 and drive roller 20. Thence, the film 39 is collected on takeup reel 21, the temperature-controlled air circulated by blower 29 having dried the gelatin coating on the film. It will be noted that after the tape 39 leaves the scraper 40 the gelatin side of the tape 39 does not touch any component of the apparatus or another portion of the tape 39 until it is fully dried and being accumulated on the take-up reel 21.
  • FIG. 4 A cross-section of the drive sprocket 20, idler 23 and lever arm 24 is shown in Figure 4.
  • the idler 23 is pinned to a pair of levers 24 by a pin 100, the other end of the levers 24 operating against the hub and shaft 101.
  • Hub 101 is pinned to retainer bar 102 by rod 103,
  • the tape 39 comprises a uniformly transparent strip having a sensitized plastic absorptive coating such as of gelatin or agar agar.
  • the strip is of non-reactive, nonporous, non-absorptive fiexible material such as cellulose acetate.
  • a suitable base strip for our hydrogen sulfide sensitive tape is 16 mm. movie film having marginal sprocket-receiving perforations for driving the tape through the sensitizing apparatus described herein and through the hydrogen sulfide analyzer-recorder referred to above.
  • the tape is passed along the trough 36 at a rate of about 45 feet per hour and immediately introduced into the drying chamber 13 wherein a temperature of about 113 F. is maintained, the dried film being accumulated on reel 21. Under these conditions, a uniform impregnation of the gelatin is obtained, the desired concentration of lead acetate being between about 0.25 to 0.30 mg. per sq. cm. which corresponds to 12 to 14 mg. per foot of 16 mm. tape.
  • the blank film 39 is fed from supply reel 48 and the gelatin coating thereof contacted at a temperature of about 113 F. in trough 36 with a solution of lead acetate and sodium acetate.
  • the solution for sensitizing the plastic coating is 1 normal lead acetate and 1 normal sodium acetate at a pH of about 6.7.
  • the pH is important because if too much acidity is present, sensitivity to hydrogen sulfide is decreased whereas if the acidity is too low, the lead will precipitate from the sensitizing solution with the result that substances such as mercaptans will have greater effect on the staining of the tape.
  • the sensitized coating obtained from the defined solution stains uniformly, has the desired optical density for a given concentration of hydrogen sulfide, and has low susceptibility to variations in optical density.
  • the coating is not light-sensitive and retains its transmittancy when exposed to the light beam and photoelectric cell arrangement used to monitor the moving tape as described in our co-pending application.
  • the film may be stored for long periods of time without impairingits sensitivity to hydrogen sulfide.
  • Our tape is uniform with respect to its buffered lead acetate content and is light-, air-, and age-stable when prepared pursuant to our system.
  • Table I Batch The apparatus described may be used on 16-mm. or
  • the method of preparing a gelatin-coated tape which is quantitatively sensitive to hydrogen sulfide and which is light-, air-, and age-stable which comprises the steps of sensitizing a gelatin coating supported by a transparent gas-impervious tape with 0.25 to 0.30 mg. lead acetate per sq. cm. from an aqueous solution comprising 1 normal lead acetate and 1 normal sodium acetate by exposing only the coated surface to a pool of the solution, a
  • the steps which comprise contacting the coating with an aqueous sensitizing solution bymoving said tape over an elongated body of the solution with said coating running over the surface of said body, said body comprising an aqueous solution of 1 normal lead acetate and 1 normal sodium acetate maintained at a pH of about 6.7, removing excess solution from the coating as it emerges from said body, and

Description

Dec. 16, 1958 Filed Aug. 15, 1956 v. SORG ET AL 2,864,725 FLUID AND SYSTEM FOR PREPARING HYDROGEN SULFIDE SENSITIVE TAPE 2 Sheets-Sheet l Dec. 16, 1958 v. SORG ETAL FLUID AND SYSTEM FOR PREPARING HYDROGEN SULFIDE SENSITIVE TAPE 2 Sheets-Sheet 2 Filed Aug. 15. 1956 v/zer zr/m gyq ldz FLUID AND SYSTEM FOR PREPARING HY DRO- GEN SULFIDE SENSITIVE TAPE,
Leonard V. Sorg and Elmer Bradley Olfutt, Kansas City, Mo., assignors to Standard Oil Company, Chicago, Ill., a corporation of Indiana Application August 15, 1956, Serial No. 604,169
Claims. (Cl. 117-83) This invention relates to the continuous treatment of strip material and, in particular, comprises improved apparatus for sensitizing one coated surface of tape or other strip material.
The manufacture of our sensitive film includes the steps of applying a liquid sensitive gelatin coating on a film support such as a continuous transparent and fluidimpervious tape. Subsequently, the coated tape is sensitized by impregnating the gelatin with a reactive solution.
In connection with a hydrogen sulfide analyzer-recorder described in our co-pending patent application Ser. No. 375,032, now issued as U. S. 2,800,397, we employ a sensitive-to-hydrogen-sulfide tape which comprises an acetate film base having a gelatin coating. This corresponds to motion picture film from which the photosensitive silver has been removed. By impregnation, we place a certain amount of lead acetate and sodium acetate into the gelatin coating.
An important object of the invention is to provide an improved apparatus for continuously feeding tape or other strip material over a treating solution to effect a controlled impregnation of a gelatin coating thereon. A further object of the invention is to provide an apparatus for the rapid, accurate and uniform treatment of the gelatin coating without injury or mutilation of the base strip material. A more specific object of the invention is to provide an apparatus which prevents the sensitized or gelatin side of the tape from coming in contact with the parts of the apparatus along which it moves to permit the use of relatively small amounts of treating solution, to provide means for maintaining the surface of the solution at a constant level, and to maintain the solution at the desired temperature.
Another object of the invention is to provide a system utilizing a sensitizing station and a drying chamber with means for feeding the supporting tape through the station and chamber in series so that the tape will be maintained in such a position that the sensitized gelatin coating is dried without contacting any portion of the apparatus. v
Still another object is to provide'a system which controls the temperature and circulates air in the drying chamber whereby there is a progressive drying of the coating to produce a non-tacky sensitized strip. Thes eand other objects of our invention will become apparent as the description thereof proceeds.
Briefly, we attain the objects of our invention by providing means'for successively impregnating and drying a gelatin coating on a fluid-impermeable tape or base material which includes a temperature-controlled impregnat- 2,864,725 Patented Dec. 16, 195s.
Figure 1 is an elevation, partly in section, showing one form of apparatus for impregnating a gelating coating on a continuous support and for drying the impregnated coating;
Figure 2 is a side elevation, partly in section, of the apparatus shown in Figure 1;
Figure 2a is an enlarged fragmentary'section of the trough; I
Figure 3 is a detail taken along the lines 33 in Figure 1; I
Figure 4 is a detail taken along the lines 4-4 in Figure 1;
Figure 5 is a detail taken along the lines 5-5 in Figure 1;
Figure 6 is a detail taken along the lines 6-6 in Figure 3; and
Figure 7 is a detail taken along the lines 77 in Figure '2.
Similar reference numbers refer to corresponding parts in the several views of the drawings.
Referring to the drawings, the framework 10, comprising angle irons, supports 0.25 inch aluminum panel 11 upon which all of the components of our apparatus are mounted. Four bolts or feet 12 extending through the lateral surfaces of the angle irons 10 permit adjusting the apparatus to a level position.
V the instrument.
ing station which is provided with means for accurately -I A compartment 13 comprised of walls 13a and hinged cover 14 comprises the drying chamber.
A motor 15, controlled by switch 16 and fused by 17, provides the drive for moving the filmor tape through Gears 18 and 19 driven by motor 15 drive sprocket 20 and take-up reel 21 through a friction clutch 22 driven through belt 27. An idler 23 presses the film into engagement with sprocket 20 thereby pre venting tape slippage. Tension is given to the idler 23 through pivoted arm 24 which is under tension from spring 25 attached-to lever 26.
Electric heater 30 furnishes heat to control the temperature of the cabinet 13 to a constant value and motor 28 drives the squirrel cage blower 29 which circulates air through the drying compartment 13 about baffie 13b.
The heater 30 is shown in Figure 1, but for simplicity has been omitted from Figure 2. Radiating fins 31 and 32 are attached to heater 30 to aid in conduction of the heat. The temperature within the drying chamber 13 is maintained constant by thermal regulator 33 and the temperature is indicated by thermometer 34.
The treating or impregnating station 35 includes the trough 36 within constant temperature bath 37. The trough 36 is provided with parallel knife edges 38 and 38a which act like a ruling pen (see Figure 2a) permitting a 0.375 inch trace of chemicals to be impregnated in the gelatin coating on the tape 39. Excess liquid is removed from the gelatin surface by transverse scraper 40.
The constant temperature bath 37 comprises an aluminum block and the temperature is maintained constant by strip heaters 41 and 42 which are controlled by thermal regulator 43, electrical power being brought to the heating elements by lead 44. Pilot li ht 45 indicates when the current is on. Power is furnished to motor 28 and heaters 30, 41 and 42 through switch 46, the circuit being fused through 47.
Film or tape 39 from the supply reel 43 passes over rollers 49 and 50 which maintain tension on sprocket 51. The supply reel 48 is maintained against a felt brake 52 shown in Figures 3 and 6 and the brake 52 is actuated through lever 53 to which is attached bearing 54. At-
tached to shaft 55 which rides in bearing 54 is drum 56 which is held against brake pad 52 by spring 57 which is anchored by pin 58. The film supply reel 48 is held onto shaft 55 by clamp 59.
Referring to Figure '5, the lever arm 53 is supported 1 3 by the panel 11. Shaft 55a is held in socket 60 which is fastened to panel 11. A bearing surface for shaft 55a is provided by collar 61, the whole assembly being held onto the shaft 55a by pin 62. t
Sprocket 51 furnishes additional braking action against the tape 39 from pulley 63, Figures 2 and 7, on which rides a small section of round leather belting 64 with tension applied by spring 65 which is anchored by pin 66. All of these wheel-like mechanisms are supported to the panel 11 by individual bearing members as shown in Figure 2.
Guide rollers 66 and 67 carry the tape 39 parallel to the exposed upper surface of the impregnation trough 36 and allow the trough 36 to be vertically adjusted so that the gelatin-coatedsurface of, the tape 39 moves over the liquid surface in the trough 36.
The impregnating solution is retained in leveling bottle 69 provided with a tube connection 70 which permits the solution to flow through the plastic tubing 71 into trough 36. The liquid level in trough 36 is raised or lowered by positioning bottle 69 along the threaded rod 72 by collar 73, which supports bottle clamp 74, the selected position being secured by nut 75.
The coating station 35, including the trough 36 and the constant temperature bath 37, is adjusted by plate 76 which is fastened to platform 77 by knurled nuts 78 and 79. Loosening the knurled nuts 78 and 79 permits plate 76 to be positioned with respect to panel 11 through slots therein.
Lateral movement of station 35, parallel to panel 11, is controlled by the studs and knurled nuts 80 and 81 which are fastened to the trough assembly or station 35 through slots in plate 76.
The entire trough assembly 35, plate 76 and platform 77 rest on steel ball 82 which in turn operates in socket 83 inplatform 77 and lower socket 84 in sub-platform 85. Stud bolts 86 and knurled nuts 87 secure the platform 77 and the sub-platform 85 together to clamp the steel ball 82 therebetween. Adjustments can be made so as to level the trough assembly 35 and to dispose the trough 36 with respect to the panel 11 and the path of travel of the tape 39 to obtain the desired contact of the gelatin coating with the liquid surface in the trough 36.
Platform 77 and sub-platform 85 are triangular sections, the apex of the triangular facing the viewer. Depending from sub-platform 85 is a threaded shaft 89 passing through support collar 90 which is rigidly secured to panel 11. Knurled nuts 91 and 92 on opposite sides of the collar 90, through which the shaft 89 freely passes, permits the entire assembly of platforms 77 and 85 through assembly 35 to be raised .or lowered and fixed in the desired position.
The unsensitized film is drawn from supply reel 48 through sprocket assembly 49, 50, 51 over roller 67 along knife edges 38 and 38a and under rollers 68 and 94, the excess solution being removed from the gelatin coating ,by scraper 40.
After the gelatin coating on the tape 39 has been impregnated with the desired chemicals it passes over positioning roller 66 and enters the drying chamber 13 through the port 95. Time for drying the coating is obtained by passing the slowly moving film over positioning rollers 96, 97, 98, 99 and drive roller 20. Thence, the film 39 is collected on takeup reel 21, the temperature-controlled air circulated by blower 29 having dried the gelatin coating on the film. It will be noted that after the tape 39 leaves the scraper 40 the gelatin side of the tape 39 does not touch any component of the apparatus or another portion of the tape 39 until it is fully dried and being accumulated on the take-up reel 21.
A cross-section of the drive sprocket 20, idler 23 and lever arm 24 is shown in Figure 4. The idler 23 is pinned to a pair of levers 24 by a pin 100, the other end of the levers 24 operating against the hub and shaft 101. Hub 101 is pinned to retainer bar 102 by rod 103,
4 the entire assembly being fastened to collar 104 through the hub and shaft 101 which passes through bearing 105. The force lever 26 is fastened to pin 106 through spring 25 which furnishes the necessary tension.
The described apparatus has been used successfully for the preparation of sensitized tape for use in connection with the hydrogen sulfide analyzer-recorder described in our co-pending application Serial No. 375,032, filed August 18, 1953, now Patent No. 2,800,397 and entitled Hydrogen Sulfide Analyzer Recorder.
The tape 39 comprises a uniformly transparent strip having a sensitized plastic absorptive coating such as of gelatin or agar agar. The strip is of non-reactive, nonporous, non-absorptive fiexible material such as cellulose acetate. A suitable base strip for our hydrogen sulfide sensitive tape is 16 mm. movie film having marginal sprocket-receiving perforations for driving the tape through the sensitizing apparatus described herein and through the hydrogen sulfide analyzer-recorder referred to above.
The tape is passed along the trough 36 at a rate of about 45 feet per hour and immediately introduced into the drying chamber 13 wherein a temperature of about 113 F. is maintained, the dried film being accumulated on reel 21. Under these conditions, a uniform impregnation of the gelatin is obtained, the desired concentration of lead acetate being between about 0.25 to 0.30 mg. per sq. cm. which corresponds to 12 to 14 mg. per foot of 16 mm. tape.
In preparing such sensitized tape the blank film 39 is fed from supply reel 48 and the gelatin coating thereof contacted at a temperature of about 113 F. in trough 36 with a solution of lead acetate and sodium acetate.
The solution for sensitizing the plastic coating is 1 normal lead acetate and 1 normal sodium acetate at a pH of about 6.7. The pH is important because if too much acidity is present, sensitivity to hydrogen sulfide is decreased whereas if the acidity is too low, the lead will precipitate from the sensitizing solution with the result that substances such as mercaptans will have greater effect on the staining of the tape. The sensitized coating obtained from the defined solution stains uniformly, has the desired optical density for a given concentration of hydrogen sulfide, and has low susceptibility to variations in optical density.
The coating is not light-sensitive and retains its transmittancy when exposed to the light beam and photoelectric cell arrangement used to monitor the moving tape as described in our co-pending application.
The film may be stored for long periods of time without impairingits sensitivity to hydrogen sulfide. Our tape is uniform with respect to its buffered lead acetate content and is light-, air-, and age-stable when prepared pursuant to our system.
A number of batches of tape produced in accordance with the above were examined with respect to the uniformity of the sensitized film coating. In making such examination, the gelatin was stripped from the base tape and treated with hydrochloric acid to produce an extract containing the dissolved lead acetate. The lead content was then determined by means of a polarographic apparatus with the results illustrated by the data shown in the following table:
Table I Batch The apparatus described may be used on 16-mm. or
5 35-mm. film when the size of the coating trough 36, the block 37, the pad rollers, the supply and take-up reels, and the tension and drive sprockets are appropriately provided.
This application is a continuation-in-part of our copending applications Serial No. 375,032, now issued as U. S. 2,800,397, and Serial No. 556,238, filed December 29, 1955, entitled Apparatus for Treating One Surface of a Strip, issued as U. S. 2,884,333.
Although we have described our invention by reference to a preferred embodiment thereof illustrated in the drawings, it should be understood that this is by way of example only. Further, it is contemplated that modifications in the apparatus and mode of using the apparatus can be made without departing from the scope and spirit of the described invention.
What we claim is:
1. The method of preparing a gelatin-coated tape which is quantitatively sensitive to hydrogen sulfide and which is light-, air-, and age-stable which comprises the steps of sensitizing a gelatin coating supported by a transparent gas-impervious tape with 0.25 to 0.30 mg. lead acetate per sq. cm. from an aqueous solution comprising 1 normal lead acetate and 1 normal sodium acetate by exposing only the coated surface to a pool of the solution, a
and subsequently drying the sensitized gelatin coating.
2. The method for preparing a hydrogen sulfide sensitive fluid-impervious transparent tape, said tape supporting a water absorptive coating which contains from 0.25
to 0.30 mg. lead acetate per sq. cm. and is quantitatively sensitive to hydrogen sulfide, the steps which comprise contacting the coating with an aqueous sensitizing solution bymoving said tape over an elongated body of the solution with said coating running over the surface of said body, said body comprising an aqueous solution of 1 normal lead acetate and 1 normal sodium acetate maintained at a pH of about 6.7, removing excess solution from the coating as it emerges from said body, and
is specifically responsive to hydrogen sulfide and which is light-, air-, and age-stable which comprises the steps of impregnating a gelatin-coated transparent gas-impervious tape with 0.25 to 0.30 mg. lead acetate per sq. cm.
by contacting the gelatin coating directly with an extended surface of a pool of a solution comprising 1 normal lead acetate and 1 normal sodium acetate at pH of about 6.7, and subsequently drying the treated gelatin coating.
5. The process of impregnating a supported gelatin coating with 0.25 to 0.30 mg. lead acetate per'sq. cm. deposited from an aqueous solution of 1 normal sodium acetate and 1 normal lead acetate at pH about 6.7 which comprises maintaining an elongated body of liquid impregnating solution, passing the gelatin coating in contact with the surface of said solution, removing excess solution from the gelatin coating at a point adjacent at end of said body and returning the removed excess to said body, and drying the impregnated gelatin coating by passing through a drying zone.
References Cited in the file of this patent UNITED STATES PATENTS Ofiutt July 23, 1957

Claims (1)

1. THE METHOD OF PREPARING A GELATIN-COATED TAPE WHICH IS QUANTITATIVELY SENSITIVE TO HYDROGEN SULFIDE AND WHICH IS LIGHT-, AIR-, AND AGE-STABLE WHICH COMPRISES THE STEPS OF SENSITIZING A GELATIN COATING SUPPORTED BY A TRANSPARENT GAS-IMPERVIOUS TAPE WITH 0.25 TO 0.30 MG. LEAD ACETATE PER SQ. CM. FROM AN AQUEOUS SOLUTION COMPRISING 1 NORMAL LEAD ACETATE AND 1 NORMAL SODIUM ACETATE BY EXPOSING ONLY THE COATED SURFACE TO A POOL OF THE SOLUTION, AND SUBSEQUENTLY DRYING THE SENSITIZED GELATIN COATING.
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US3123443A (en) * 1960-04-18 1964-03-03 Composition for diagnosing glucose
US3127281A (en) * 1964-03-31 Means and method of making multi-test indicator
US3173034A (en) * 1960-09-16 1965-03-09 Singer Inc H R B Ultrasonic device
US4115067A (en) * 1975-09-29 1978-09-19 Combustion Equipment Associates Inc. Pollution monitoring apparatus
US4174202A (en) * 1977-11-28 1979-11-13 The Dow Chemical Company Kit and method for testing liquids for hydrogen sulfide content
US4328181A (en) * 1979-07-06 1982-05-04 Minnesota Mining And Manufacturing Co. Indicator material
US4385095A (en) * 1982-05-26 1983-05-24 North American Philips Corporation Wide angular range X-ray diffraction reference standard composite
US6217827B1 (en) * 1999-03-25 2001-04-17 Zellweger Analytics, Inc. Hydride gas detecting tape
US20100151115A1 (en) * 2008-12-17 2010-06-17 Honeywell International Inc. Method and system for producing a gas-sensitive substrate

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US2368176A (en) * 1940-09-20 1945-01-30 Trist Arthur Ronald Machine for the coating of webs of paper and like absorbent material
US2569755A (en) * 1949-06-23 1951-10-02 Technicolor Motion Picture Method and apparatus for striping film
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US3127281A (en) * 1964-03-31 Means and method of making multi-test indicator
US3123443A (en) * 1960-04-18 1964-03-03 Composition for diagnosing glucose
US3173034A (en) * 1960-09-16 1965-03-09 Singer Inc H R B Ultrasonic device
US4115067A (en) * 1975-09-29 1978-09-19 Combustion Equipment Associates Inc. Pollution monitoring apparatus
US4174202A (en) * 1977-11-28 1979-11-13 The Dow Chemical Company Kit and method for testing liquids for hydrogen sulfide content
US4328181A (en) * 1979-07-06 1982-05-04 Minnesota Mining And Manufacturing Co. Indicator material
US4385095A (en) * 1982-05-26 1983-05-24 North American Philips Corporation Wide angular range X-ray diffraction reference standard composite
US6217827B1 (en) * 1999-03-25 2001-04-17 Zellweger Analytics, Inc. Hydride gas detecting tape
US20100151115A1 (en) * 2008-12-17 2010-06-17 Honeywell International Inc. Method and system for producing a gas-sensitive substrate

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