Photographic film unit having gravure coated, tapered thickness layer
AssigneePolaroid Corporation
InventorsJohn J. Dennis, Jr., Thomas P. McCole
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Abstract
Method for making sheet materials are disclosed having a layer or layers of a non-uniform thickness, in particular a method of making sheet materials tapered from a maximum thickness near one and to a minimum thickness near the opposite end; and sheet materials prepared by such methods. The preparation of photographic film assemblages is disclosed including a first sheet material including at least one photosensitive layer and a second sheet material in super position therewith, which assemblages are adapted for forming photographic images viewable as reflection prints without separation of the respective sheet materials.
Claims17
In the method of manufacturing a photographic film assemblage including:
- a. a pair of dimensionally stable elements in face-to-face contact having at least an image area therebetween;
- b. a sheet-like support adjacent one of said elements;
- and
- c. at least a pair of elongated spacing layers each formed by applying to said sheet-like support at least a coating, tapered in thickness, of a pigment-containing liquid coating composition so that said spacing layers taper in thickness from a maximum near the leading end of said image area to a minimum near the trailing end of said image area, said supported spacing layers forming a spacing element which is adhered to at least one of said dimensionally stable elements at the lateral margins of said image area;
- said assemblage adapted to be processed by a viscous liquid processing agent distributed between said dimensionally stable elements in a layer at least coextensive with said image area;
- the improvement comprising preparing said spacing layers by doctoring said liquid into the cells of a gravure roller varying in depth according to the taper desired;
- pressing said gravure roller into contact with said support to transfer said liquid thereto;
- and drying said liquid to a solid state to form a tapered thickness coating.
In a method of manufacturing a photographic film unit comprising two substantially rectangular sheet-like elements secured in face-to-face relation by a binding sheet which is formed with a rectangular opening defining an image area and includes lateral, leading and trailing end sections surrounding said opening, said binding sheet adhered to the surface of one of said elements with at least part of said lateral sections of said binding sheet folded around the lateral edges of both said elements and adhered to the margins of the second of said elements;
- the improvement comprising the steps of forming said binding sheet tapered in thickness at least at its lateral sections from a maximum near the leading end of the opening therein to a minimum at the trailing end of the opening by:
- forming a gravure roller having at least a first region with cells of a uniform maximum depth and an adjacent second region having cells tapering from said maximum depth to a minimum depth;
- doctoring a liquid containing a pigment into said cells;
- pressing said gravure roller into engagement with a support sheet to transfer said liquid from said roller to said support sheet;
- drying said liquid to form a solid, pigment-containing coating including a first area of substantially uniform maximum thickness and a second area tapering from said maximum thickness at said first area to a minimum thickness;
- and
- forming a rectangular opening in said second area.
Dependencies are inferred from the claim text.