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Publication numberUS3661578 A
Publication typeGrant
Publication dateMay 9, 1972
Filing dateApr 1, 1969
Priority dateApr 1, 1969
Publication numberUS 3661578 A, US 3661578A, US-A-3661578, US3661578 A, US3661578A
InventorsMason Paul B
Original AssigneePolaroid Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 3661578 A
A dryer for photographic sheet material having an image-receptive layer. The dryer includes a support having a covering thereon adapted to contact and support the photographic sheet with the image-receptive layer in contact with the covering. The dryer also includes means for advancing the covering and photographic sheet past a heated platen located in contact with the side of the photographic sheet opposite the side in contact with the covering for vaporizing liquid previously absorbed into the sheet during processing thereof and driving the vapor into the covering from which it is subsequently removed.
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Description  (OCR text may contain errors)

[151 3,661,578 May 9, 1972 United States Patent Mason 10/1965 Wickeretal..................... ...34/95X [54] DRYER [72] Inventor:

Paul B. Mason, Magnolia, Mass.

Primary E.\'aminerNorman G. Torchin Assistant Examiner-John L. Goodrow [73] Assignee: Polaroid Corporation, Cambridge, Mass.

Apr. 1, 1969 AttorneyBrown and Mikulka, Robert E. Corb and Alfred E. Corrigan [22] Filed:

[57] ABSTRACT A dryer for photographic sheet material having an image- Appl. No.: 812,259

Related US. Application Data [63] Continuation-impart of Ser. No. 722,855, Apr. 22,

receptive layer. The dryer includes a support having a covering thereon adapted to contact and support the photographic sheet with the image-receptive layer in contact with the cover- 1968, abandoned.

ing. The dryer also includes means for advancing the covering and photographic sheet past a heated platen located in contact m I- C n I 1 .l 5 it with the side of the photographic sheet opposite the side in m r m f 0 M k F .I. oo 5 contact with the covering for vaporizing liquid previously absorbed into the sheet during processing thereof and driving the References Cited vapor into the covering from which it is subsequently removed.

UNITED STATES PATENTS 3,074,332 Robinson............................,..34/95 X 5 Claims, 5 Drawing Figures PATENTEDMAY 91912 SHEET 1 BF 4 FIG.


INVENTOR PAUL a. MASON SHEET 2 OF 4 l @fa 1 A x mmfl 3x6 n PATENTEDMM 91912 3,661,578 7 sum 3 OF 4 INVENT I I PAUL B. MAS

6am a! W W 6. fi w,


SHEET 4 [1F 4 INVENTOR. PAUL B. MASON @lwwnandW and ATTORNE S DRYER This application is a continuation-in-part of my copending application Ser. No. 722,855 filed Apr. 22, 1968 and now abandoned.

The dryer of the present invention is especially designed for use in a photographic process in which a composite photosensitive and image-receiving sheet is exposed to form a latent image and is thereafter treated with an aqueous alkaline processing liquid to produce a visible image by a difiusion transfer process. The sheet material comprises, for example, a paper support carrying on one side at least a layer containing a gelatino silver halide stratum and a surface stratum comprising a matrix, e.g., gelatin, including a translucent pigment and a substance providing an image-receptive environment. An aqueous alkaline processing liquid is applied to the coated side of the sheet causing the sheet to swell and effect the formation of a visible image in the surface stratum by a diffusion transfer process.

Objects of the invention are: to provide a dryer for drying a sheet of the foregoing type rapidly, uniformly, and completely without overheating the sheet while simultaneously reconstituting the sheet; and to provide a dryer of the type described which is nonadherent to the sheet and will not mar the image surface of the sheet; and a method for processing an exposed photographic sheet.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the apparatus possessing the construction, combination of elements and arrangement of parts and the process involving the several steps and the relation and order of one or more of such steps with respect to each of the others which are exemplified in the following detailed disclosure, and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings wherein:

FIG. 1 is a sectional, elevational view of photographic document copying apparatus embodying the invention;

FIG. 2 is a perspective view of the transport and applicator systems employed in the photographic document copying apparatus;

FIG. 3 is a perspective view of the dryer section employed in the apparatus; 7

FIG. 4 is a sectional view of a brake means utilized in the instant invention; and

FIG. 5 is a perspective view of an alternative type of dryer drum which may be utilized in the instant invention.

The document copying apparatus embodying the instant invention is shown in FIG. 1 as including an exposure system comprising a generally horizontal, transparent window comprising one end wall of a chamber 12 in which are mounted lamps l4 and baffle means 16 for illuminating an original document positioned for exposure on the upper surface of window 10. The chamber is defined by walls comprising the housing of the apparatus including a lower wall 18 located towards the other end of chamber 12 and provided with a centrally located opening 20 in which is mounted an objective lens and shutter assembly 22 of a conventional type employed in photography and side walls 40, 48 which define opposite sides of chamber 12. The apparatus is primarily intended to photograph rectangular subjects and accordingly, window 10 is rectangular in shape having length and width dimensions at least equal to those of the largest document, e.g., 8 k X 14 inches, usually reproduced.

Means are provided for supporting successive areas of a light-sensitive, image-recording sheet designated 24, in posi' tion for exposure to light from an original, positioned on window l0, transmitted by lens 22. These means include a housing 26 comprised of a substantially planar wall 28, a curved wall 30 and end members 32, 34, all of which cooperate to form a chamber 35. Walls 28 and 30 are substantially of the same width as sheet 24 and are provided with a plurality of apertures 36. An endless belt 38 mounted on drive rolls 42, 44, 46, 50 and having an adjustable tensioning roll 52 mounted for movement in slot 54, encompasses the chamber 35. Belt 38, which is perforated throughout and is made from any suitable material such as an organic plastic sheet, for example, a film of polyethylene terephthalate resin, such as Mylar, is of substantially the same width as walls 28 and 30, and is comprised of a first span located between roll 42 and a knife 82 for supporting a section of sheet 24 in position for exposure and a second span located between rolls 46 and 50 for supporting the exposed section during development thereof. Blower means 53 mounted on side wall 34 is provided for reducing the pressure within chamber 35 to hold the photosensitive sheet 24 against belt 38, i.e., the lower pressure within chamber 35 acts upon sheet 24 by virtue of apertures 36 and the perforations in the belt 38. As can be seen in FIG. 1, a section of photosensitive sheet 24 is held in position for exposure by a generally U-shaped member 56, the legs 58 of which are pivotally attached at their free ends to suitable support means by pivot means 60. The other ends of legs 58 are connected by a member 62 having a plurality of resilient discs 64 mounted thereon. U-shaped member 56 is biased against the lower end of the sheet 24 by spring 59 such that resilient members 64 contact the bottom portion of the section of the photosensitive sheet 24 and hold it against member 84. A rotary solenoid 61 is coupled to one leg 58 of member 56 for pivoting the latter to the dotted line position shown in FIG. 1. The upper portion of the section of photosensitive sheet 24 is maintained in place by guide members 66, 68.

A mirror 70 is arranged substantially at a 45 angle with respect to the axis of lens 22 and the plane of wall 28 for redirecting light from the lens toward the wall 28 and the section of photosensitive sheet 24 positioned thereon, and producing the geometric image reversal required for a correct copy of the original. Mounted below the mirror 70 is a compartment 71 for housing controls of the apparatus.

Photosensitive sheet 24 is supplied coiled upon a spool mounted within a container 72 mounted above housing 26. The spool is provided with a pair of disc members 73, only one of which is shown, and container 72 is provided with an opening 75 through which brake means may be applied to one of the discs to retard rotation thereof, i.e., to prevent freewheeling of the spool when sheet 24 is being withdrawn therefrom. Brake means 150 is mounted on a wall of chamber 83 and is comprised of a pressure-bearing member 152, a tube 154 telescopically receivable in member 152 and a spring 156 for exerting a force against member 152. In order to maintain member 152 in engagement with tube 154, member 152 is provided with a pin 158 which rides in a groove 160 in tube 154. The end of member 152 is tapered at 162 to facilitate entry of the brake means into opening 75. The braking force of the brake means is greater than that exerted on the sheet 24 by the belt 38 but less than the force exerted on the sheet by the drive roll 74. Container 72 is provided with a neck portion 77, having suitable light shield means therein, through which a portion of sheet 24 originally protrudes. To load the container 72 into the apparatus, a door 79 hinged about 81 is pivoted to the open position and the container positioned within compartment 83 such that the neck portion 77 is in alignment with an opening 85 in chamber 83. In this position the protruding portion of sheet 24 falls in place between suitable advancing means as will be shortly explained. Any suitable means such as block 87 may be provided to facilitate the proper positioning of container 72.

The sheet 24 is advanced from the container 72 by a feed roll 74 cooperating with guide 68. Guide 68 is pivotally mounted on a suitable support by pivot means 78 and means such as a solenoid 80 are provided for pivoting guide 68 about pivot 78 such that the end of sheet 24 which is between guides 66, 68 is forced into contact with feed roll 74.

In photographic apparatus of the foregoing type, it has been found that a certain amount of vignetting occurs along the outer edges of the section of photosensitive sheet 24, positioned adjacent wall 28 when the material supported by window is exposed. This vignetting or darkening, is due in part to the fact that a light ray emanating from lamp l4 and directed towards an opposite end of an original positioned for exposure on window 10, must travel further than one directed at a center portion of the original or document, thereby having less energy (ability to photographically expose the original) than the wave directed toward the center portion. In other words, the intensity of the light incident upon window 10 by lamps 14 diminishes as you move from the center of window 10 outwardly towards the ends and sides thereof. Needless to say, this vignetting is undesirable in that it reduces the effective area of the sheet positioned adjacent wall 28 which is available for properly reproducing the image of the object placed on window 10.

To obviate this problem there is provided a structure comprised of two baffle means 16 having a longitudinal dimension substantially equal to the width of chamber 12, i.e'., they run substantially the length of side walls 40, 48, a pair of generally planar deflectors 13 pivotally mounted at 15 to the side walls 40, 48 of chamber 12 and a pair of triangular members 76, one being mounted on each of the remaining side walls of chamber 12. Members 76 are provided with a reflective coating, e.g., a matt or white calender finish, for increasing the intensity of the light incident upon the intermediate surfaces of the sides of the original positioned between and transverse to walls 40, 48. Each of the bafflemeans 16 is comprised of a pair of end plates 19 which are connected by generally C-shaped members 21. Members 21 include a baffle portion 23 which substantially prevents any light emanating from its associated lamp 14 from directly striking the major portion of window 10 which is located at the same side of the chamber 12, and a curved surface 25 having a generally parabolic configuration in cross section. The interior surfaces 27 of members 21 have a spectral or mirror-like finish in contrast with'surfaces 29 which have an absorptive finish, e.g., flat black paint. Surfaces 31 of deflectors 13 are provided witha diffusinglyreflective surface, e.g., gray. Baffle portion 23, iniaddition to substantially preventing any light emanating from its associated light source from directly striking an adjacent side or portion of window 10, also prevents any light from its associated lightproducing means from being reflected directly by the window 10 to the lens in assembly 22. In order to reduce specular reflections, the exterior surfaces of the baffle means 16, the surfaces 33 of deflectors 13,'end plates 19 and the interior side walls and lower wall 18 of chamber 12 all have a substantially absorptive or nonreflective type finish thereon, e.g., a flat black paint.

As can be seenin FIG. 1, light emanating from a lamp 14 is reflected by the reflector surface 27 of its associated baffle means 16 toward an opposite side of chamber 12 and is deflected by the baffle portion 23 towards an opposite side of window 10, i.e., light emanating from the lamp 14 positioned at the left hand side (as viewed in FIG. 1) of chamber 12 is reflected and directed towards the opposite or right hand side of window 10. Also, some of the lightemanating from the left hand lamp 14 is reflected by surface 31 of the deflector 13 mounted near the right hand side of chamber 12 and redirected towards the adjacent portion of window 10, i.e., the right hand portion. This redirected light adds to the intensity of the light incident upon the right hand side of window 10 such that the intensity of the light incident upon the window increases outwardly from the center of window 10. The pivotal connection 15 provides a means whereby the angle which the deflectors 13 make with respect to the plane of window 10 may be changed to vary the rate at which the intensity of the light incident upon the window changes. It has been found that an angle of 65, as measured between the deflector 13 and window 10, will provide the required change in intensity incident upon window 10 when the angle between a plane parallel with the axis of lens 22 and a plane containing the free ends 37 of end members 19 is approximately 16. Although chamber 12 is shown as being provided with two fluorescent lamps 14, it is within the scope of the invention to have a single fluorescent tube mounted adjacent wall 18 and extending substantially around the periphery of chamber 12; or, the fluorescent tube may be replaced by a plurality of incandescent lamps, e.g., one placed at each comer of chamber 12 adjacent wall 18.

When it is desired to expose the section of sheet 24 which is in position for exposure, a switch is closed to complete a circuit through blower 53 and the motor for driving roll 74, paper transport rolls 42, 44, 46 and 50, paper feed rolls 86, 88 and the rolls 206, 208 for rotating the dryer drum. After a predetermined period of time, during which the pressure within chamber 35 has been reduced to a level sufficient to hold sheet 24 against belt 38, solenoid 61 pivots U-shaped member 56 to the dotted line position shown in FIG. 1 wherein cross member 62 is located outside of the projected image of the original. Subsequent to movement of U-shaped member 56 to the dotted line position, lamps 14 are turned on and the shutter assembly 22 is actuated to expose sheet 24. After the section of sheet 24 has been exposed, solenoid is actuated to pivot guide 68 about pivot 78 and force sheet 24 into frictional engagement with drive roll 74. Alternatively, guide 68 could be stationary and drive roll 74 could be mounted on guide 66 which in turn would be pivotally coupled to the apparatus in a manner similar to that of guide 68. Roll 74 is maintained out of contact with the sheet when the roll is not rotating in' order to prevent damage to the sheet 24 by impression. The exposed section is then fed past the knife 82 and into the bite of a pair of drive rolls 86, 88. Drive roll 86 is comprised of a shaft 90 having a plurality of axially spaced discs 92 mounted thereon. Positioned adjacent rolls 86, 88 is a guide member 94 having a plurality of fingers 96 thereon, said fingers being adapted to enter the spaces between discs 92 to insure that the leading edge of the section will be directed toward a liquid applicator indicated generally by reference character 100.

Applicator 100 includes a body 102, a roll 104, and a cover 106 pivotally mounted at 108 to body 102 for sealing engagement therewith in the closed position. Body 102 is formed with an elongated well 110 extending substantially from end to end of the body and having a length at least equal to the width of the sheet material 24 to be coated. Roll 104 is cylindrical, has a length at least equal to the width of the area of the sheet material 24 to be coated, is partially submerged in a processing liquid 112, and is mounted for counterclockwise rotation (as viewed in FIG. 1). Mounted between body'102 and cover 106 is a guide member 114 which cooperates with another guide member 116 and a portion 117 of body 102 for directing the exposed section in a path tangent to the surface of roll 104. For a more detailed description of applicator 100 reference is made to the copending U.S. application of Nicholas Gold, Ser. No. 723,040, filed Apr. 22, 1968 and now U.S. Pat. No. 3,552,292.

The processing liquid 112 is contained in a container 118 and is delivered to a well 110 in body 102 via a line 120. An open end 122 of container 118 is immersed in a vessel 124 and the height of the liquid in vessel 124 and in well 110 is controlled in part by the negative pressure in that portion of container118 that lies above the level of the liquid in the container 118. When the level of the liquid in vessel 124 drops below the open end 122 an air bubble can rise to the top of container 118 thereby allowing some of the liquid therein to flow into vessel 124. Any suitable means may be provided for sheet, preferably to effect image formation by a silver halide diffusion transfer process. For examples of such processes and the materials useful therein, reference may be had to copending U.S. applications Ser. No. 519,995 of Edwin E. Land, and Ser. No. 519,884 of Edwin H. Land et al., both filed Jan. 1, 1966. These applications describe a combination imagerecording and image-receiving sheet comprising a support such as paper, at least one layer containing a light-sensitive material such as a silver halide emulsion, and an outer layer comprising a translucent material such as finely divided titanium dioxide dispersed in a suitable, permeable, colloidal carrier or matrix such as gelatin which is permeable to an aqueous processing liquid. The translucent pigment may be incorporated in the layer containing the light-sensitive material and/or may comprise a separate outer layer which may also contain silver precipitating nuclei and is sufficiently transparent to permit exposure of the light-sensitive layer therebeneath, while at the same time, being sufficiently opaque to provide the requisite background for a positive silver image transferred thereto by diffusion and to mask a' negative image formed thereunder. Processing of the exposed image-recording sheet is accomplished by applying an aqueous liquid including a silver halide complexing agent to the side of the sheet opposite the support so as to impregnate the light-sensitive layer with sufficient processing liquid to produce a positive silver transfer image on the surface of the translucent layer. 7

The processing liquid may be nonviscous, i.e., have the viscosity of water, or it may include a film forming agent and range in viscosity from that of water to a viscosity of 200,000 centipoises at C. The operation and construction of the liquid applicator will depend to a large extend upon the nature and viscosity of the liquid, but in any event, will be designed to apply the processing liquid to at least the exposed (rectangular) area of each section of the photosensitive sheet as the section is advanced through the processing section of the apparatus.

After the exposed section of sheet 24 has been treated with processing liquid, it is redirected back onto the perforated belt 38 by guide 114 and the slot 126 formed between body 102 and cover 106. The guide 114 and slot 126 cooperate to direct the exposed section of sheet 24 in a path which is substantially tangent to the portion of belt 38 supported by wall 30. This permits the exposed section to be gently placed on the moving belt and precludes the leading edge of the exposed section from stubbing itself against the belt. When the exposed section contacts the moving belt 38, the lower pressure within housing 26 provides the means for maintaining the exposed section in position on the belt. Located adjacent curved wall 30 is a control in the form of a photocell 128. Photocell 128 is responsive to light emanating from a light source 130 positioned within housing 26 via an elongated slot 132 for maintaining the circuit to the knife solenoid (not shown) in an open condition and the circuit for solenoid 80 in a closed or conducting condition. The exposed section continues to be advanced upwardly (as viewed in FIG. 1) by belt 38 until the leading edge of the exposed section is sensed by photocell 128. At this point, the paper interrupts a beam of light being emitted by lamp 130 and directed from housing 26 via slot 132 toward the photocell. When the light falling on the photocell is interrupted, the circuit to solenoid 80 is opened thereby allowing guide 68 to pivot in a clockwise manner (as viewed in FIG. 1) to release sheet 24 from frictional driving engagement with roll 74. Simultaneously, the circuit to the knife solenoid is completed thereby actuating knife 82 to sever the exposed section from the remainder of sheet 24. If the length of the copy is to be 14 inches, then photocell 128 will be located 14 inches from the knife 82 as measured along the path of travel of the exposed section. Also, if desired, slot 132 could be elongated so as to measure several inches in length and photocell 128 and lamp 130 could be mounted for simultaneous movement along the length of the slot to vary the length of the severed section in proportion to the size of the original being reproduced.

After the severed section has made full contact with belt 38, i.e., belt 38 is completely supporting the severed section, belt drive rolls 42, 44, 46 and 50 are stopped and the severed section held in position against belt 38 for a predetermined period of time until the difiusion transfer process has been substantially completed. Belt drive rolls 42, 44, 46 and 50 are again started and the severed section is advanced toward a dryer station indicated generally at 200 whereat the exposed section of sheet 24 is dried.

As can be clearly viewed in FIG. 3, dryer station 200 is comprised of a perforated hollow cylindrical member 202, constructed of metal or cardboard, suitably supported for clockwise rotation (as viewed in FIG. 1) about is longitudinal axis by drive rolls 50, 206 and 208 which cooperate with other parts of the dryer station to advance a sheet of material through the dryer station. The ends of member 202 are provided with apertured end plates 204, the plates being apertured to allow air being exhausted from housing 26 to pass through the interior of cylindrical member 202 as will be more fully explained hereinafter. A blanket orlayer of porous, compliant material 203, e.g., open cell polyurethane foam or felt, is wound around member 202. A layer of pile fabric 210, e.g., woven nylon or felt, is positioned about the external surface of layer 203 and secured in place by suitable means. Altematively, a layer of cotton kite string could be tightly wound in a helical fashion about layer 203 or the layer could be knitted and pulled over layer 203. The layer of cotton string or knitted material would thus present a continuous unbroken surface, i.e., there is no transverse line formed by the joining of the ends of a single sheet of material.

Mounted above and in contact with cylindrical member 202 is a heater assembly comprised of a platen 212 made from a sheet of stainless steel, a heating element 214, e.g., a sheet heating element manufactured by the Chemelex'Corporation of Danbury, Connecticut, and sold under the trademark Cellotherm; and a layer of asbestos 216 suitably held in contact with each other by a plurality of straps 218. Platen 212 has a reverse curve portion 213 for deflecting the exposed section of sheet 24 into the bite between cylindrical member 202 and platen 212. The temperature of the assembly is controlled by a temperature responsive element 220 imbedded in sheet 214 and having leads which pass through the asbestos layer 216. Each of the layers 212, 214, 216 extend the length of member 202. A pressure plate 222 having a pressure adjusting means 224 is mounted above the heater assembly.

As the exposed section of sheet 24 passes between roll 50 and cylindrical member 202, its leading edge is deflected by portion 213 of platen 212 into the bite between platen 212 and the rotating cylindrical member 202. The leading edge of the exposed section lifts platen 212 from contact with cylindrical member 202 so as to allow the exposed section to pass therebetween. The exposed section of sheet 24 then moves into contact with the pile covering on member 202 with the image-containing layer of the sheet in contact with the covering. The sheet and the section of member 202 upon which it is supported are then advanced together relative to the platen 212. Heat from platen 212 drives any processing liquid on the exposed section into the layer of pile fabric on cylindrical member 202 and subsequently into the compliant porous layer 203 and finally through the perforations in cylindrical member 202 into the interior of drum 202 where it is carried off to a suitable reservoir by the flow of air theretltrough generated by blower 53. The flow of air through cylindrical drum 202 is conducted thereto via duct 220.

The exposed section is carried through the dryer station until its leading edge contacts a guide member 232 which guides the exposed section from the surface of cylindrical member 202 into a delivery station 234. Drying of the exposed section as it passes through the dryer station may have a tendency to make the dried copy assume a curved configuration. Accordingly, the curvature of guide 232 is very important and is selected to assure that the finished copy delivered to section 234 assumes a substantially fiat configuration.

FIG. shows a modified type of dryer drum, the heater platen not being shown in order to clarify the drawing. Here, the cylindrical member or drum 202 of FIG. 4 is replaced by a cylindrical drum 302 having reinforcing plates 304 at each end thereof and a third reinforcing plate 306 positioned intermediate the ends of drum 302 in order to more uniformly support the drum and its covering against the platen. Reinforcing plates 304 are provided with drive means in the form of a starshaped socket 308 for receiving the ends of suitably shaped drive shafts for rotating drum 302. Encompassing drum 302 is a pile covering 310 formed, for example, of l) a woven nylon material or (2) short lengths of nylon suitably flocked onto drum 302. Positioned below drum 302 is a U-shaped chamber 312 the legs of which receive a peripheral portion of drum 302 to close the top of the chamber. Chamber 312 has an opening 314 at one end in communication with duct 220 for receiving and directing a stream of air through chamber 312.

As in the previous embodiment, the sheet to be dried is advanced onto the pile covering 310 of the rotating drum 302 with the image-containing layer of the sheet in contact with the pile covering. The sheet and the supporting pile covering then move past the platen 212 and heat from the platen vaporizes the excess liquid absorbed in the sheet and drives the vapor into the pile covering supporting the sheet. After the sheet 24 passes beneath the platen, finger 232 removes the sheet from the surface of the pile covering and the area of the pile covering which now contains the vaporized liquid from the sheet 24 continues to be rotated to a position intermediate the legs of the chamber 312 whereat the vapors are removed from the pile covering by a stream of air which is passing through the chamber. The vapors are directed out of chamber 312 via open end 316 to a condensing area (not shown).

From the foregoing it is apparent that there has been disclosed a novel apparatus and method for drying a photographic sheet. The apparatus is simple, inexpensive, reliable and easy to maintain and includes a support having a covering thereon for receiving and supporting a photographic sheet with the image-containing layer of the photographic sheet in contact with the covering. The support and sheet are advanced past a heated platen which vaporizes liquid absorbed in the sheet and drives it into the covering from where it is subsequently removed. The pile covering provides a surface for supporting the photographic sheet uniformly and with a minimum of contact, exhibits excellent absorbency and compliency characteristics and has the ability to readily release the photographic sheet after passing under the platen. The method of drying the sheet includes a minimum of steps while simultaneously providing the desired characteristics of a dried photographic sheet without adversely affecting the quality of the image.

Since certain changes may be made in the above apparatus and method without departing from the scope of the invention herein involved, it is intended that all matter contained in the I above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is: l. A photographic process comprising: exposing a photographic sheet to actinic light; applying a processing liquid to an image-receptive surface layer of a photographic sheet for absorption into said sheet; forming a transfer image on said image-receptive layer; superposing said image-bearing, image-receptive layer in contact with a pile surface; advancing said sheet and said pile surface together as a unit; applying heat to the opposite side of said sheet to vaporize said liquid and drive the vapor of said liquid from said sheet into said pile surface; and drying said pile surface. 2. The process of claim 1, wherein said sheet is removed from said pile surface prior to said vapor being removed from said pile surface.

3. The process of claim 2 wherein said liquid includes water. 4. The process of claim 3 wherein said liquid is vaporized by pressing against the side of said sheet opposite said pile surface a heated platen.

5. The process of claim 4 wherein said vapor is removed from said pile surface by directing a stream of moving air against said pile surface.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3074332 *Oct 20, 1958Jan 22, 1963Cons Electrodynamics CorpDrying platen for a recording system
US3214327 *Apr 16, 1963Oct 26, 1965Huyck CorpPapermakers' felts and method for dewatering paper and similar webs
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6018887 *Jul 13, 1998Feb 1, 2000Kalaydjian; ArsenDrying apparatus for photo prints
US7946054 *Jan 26, 2006May 24, 2011Bsh Bosch Und Siemens Hausgeraete GmbhFront assembly for a tumble dryer
US20070151118 *Dec 15, 2006Jul 5, 2007Luciano PeregoDevice for radiation drying
US20080163510 *Jan 26, 2006Jul 10, 2008Bsh Bosch Und Siemens Hausgerate GmbhFront Assembly for a Tumble Dryer
U.S. Classification430/248, 34/95
International ClassificationG03D15/02, G03B17/48, G03B17/52
Cooperative ClassificationG03D15/027, G03B17/52
European ClassificationG03B17/52, G03D15/02P