JP3840333B2 - Monosheet instant photographic film and frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a positive-type photographic light-sensitive material sheet, a negative-type photographic light-sensitive material sheet, a mono-sheet type instant photographic film composed of a light-sensitive material laminate comprising a photographic developing solution and a frame, and the periphery of the mono-sheet type instant photographic film. It is related with the flame | frame useful for sealing of.
[0002]
[Prior art]
Although photographic film used in instant cameras is more expensive than ordinary photographic film, it does not require development and printing costs, and you can see photographic images taken immediately after shooting. There are advantages. For this reason, the demand is increasing recently. Currently, peel apartment type and mono sheet type are mainly used for photographic films used for instant cameras. A monosheet type photographic film has a structure in which a color image receiving element, a color image donating element and a photographic developing solution are integrated, and it is necessary to peel off a positive type photographic photosensitive sheet after photographing like a peel-apart type. It has no advantage.
[0003]
The mono-sheet type photographic film includes a positive type photographic light-sensitive material sheet (color image receiving element + neutralizing element, having a transparent support on the surface) and a negative type photographic light-sensitive material sheet (color image donating element and light-shielding support). And a type having a structure in which a photographic developing solution can be injected between the two after photographing, and an image receiving portion (color image receiving element, transparent support on the surface). Photographic developing solution can be injected after photographing between the image forming part consisting of the image forming part (color image donating element and light-shielding layer) and the cover sheet part (neutralizing element) and the cover sheet part. It is divided roughly into the type which has the structure which has.
[0004]
Regardless of whether the mono-sheet type photographic film is the former type or the latter type, the photographic developing solution is used for the positive photographic photosensitive material sheet and the negative photographic photosensitive material sheet, or the image forming unit. It is necessary to be injected between the cover sheet portion and uniformly spread. However, there are actually portions that are not uniformly developed, and there are cases where bubbles are mixed in the photographic developing solution when developing. In particular, in the peripheral portion of the photosensitive material sheet, a portion where the photographic developing solution is not spread tends to remain, and bubbles mixed in the photographic developing solution are difficult to escape. Therefore, the monosheet type photographic film has a white undeveloped portion or a trace of bubbles remaining in the peripheral portion of the developed photographic image, and it may be difficult to see the photographic image (occurrence of defective portion). There's a problem.
[0005]
In order to solve such a problem, a method is used in which an outer frame is provided in advance at the peripheral edge of a photographic image to hide a defective portion of the photographic image. Usually, in the former type of mono-sheet type instant photographic film, the outer frame is bonded to the upper surface of the positive photosensitive material sheet, and in the latter type, the outer frame is provided between the image forming unit and the image receiving unit.
[0006]
The outer frame attached to the upper surface of the positive photosensitive material sheet of the mono sheet type instant photographic film not only hides a defective part as a photographic image, but also positive and negative photographic photosensitive material sheets and photographs. It also has a role of sealing the photosensitive material laminate composed of the developing solution packaging as a unit. Therefore, the outer frame is required to have a concealing property for hiding the peripheral portion of the photosensitive material sheet and a moisture-proof property for preventing the adhesiveness from being peeled off due to moisture in the air.
FIG. 4 shows an example of a cross section of an outer frame (hereinafter referred to as a frame) that is generally used at present. As shown in the figure, the frame 20 is composed of a white surface layer 21, an aluminum metal layer 23, a resin film layer 24 made of polyethylene terephthalate, and an adhesive layer 25 in order from the top (outside). The aluminum metal layer 23 provides concealability and functions as a moisture-proof material. This aluminum metal layer is laminated on the resin film by a vapor deposition method in order to reduce the thickness of the frame. The white surface layer 21 not only protects the aluminum metal layer, but also makes it easy to organize the instant photographic film by entering the date and the like with a writing instrument. Furthermore, the white surface layer has the effect of making the color of the photographic image appear more vivid.
[0007]
[Problems to be solved by the invention]
However, since the white surface layer of the frame is laminated on the aluminum metal layer, the surface layer is easily peeled off, or the tip of the writing instrument comes into contact with the aluminum metal layer, and the aluminum metal layer is easily damaged. There was a thing. Further, the whiteness of the surface layer may also be lowered without taking advantage of the original whiteness of the surface layer material due to the metallic luster of aluminum. Further, when the surface layer material is applied to the aluminum metal layer, the aluminum metal layer rubs against the coating part (head) of the coating machine, so that the surface of the aluminum metal layer is scratched and the productivity tends to be lowered. .
[0008]
Accordingly, an object of the present invention is to provide a mono-sheet type instant photographic film in which the white surface layer of the frame of the instant photographic film is hardly peeled off, is not easily scratched even if written with a writing instrument, and the photographic image can be seen more clearly. There is. That is, an object is to make the white surface layer of the frame difficult to be peeled off or scratched, and to improve the whiteness. Another object of the present invention is to make the aluminum metal layer less likely to be damaged when the white surface layer material is applied to the aluminum metal layer, and to improve the productivity of the frame.
[0009]
[Means for Solving the Problems]
The above-mentioned problems are composed of a positive-type photographic photosensitive material sheet, a negative-type photographic photosensitive material sheet, a photosensitive material laminate comprising a photographic developing solution-encapsulating body, and a frame that seals the periphery of the laminate from the outside. Monosheet type instant photographic film, in which the frame is laminated in order from the inside, an adhesive layer, a resin film layer, an aluminum metal layer, a resin film layer, and a white surface layer composed of a white pigment and a polymer binder It can be achieved by a mono-sheet type instant photographic film characterized in that it is composed of a laminated sheet.
[0010]
A preferred embodiment of the present invention is that both of the resin film layers of the frame are layers made of a polyester resin. The thickness of the resin film layer of the frame is preferably in the range of 10 to 15 μm, and the difference in thickness is preferably 2 μm or less.
[0011]
The present invention also relates to a frame in which a photographic light-sensitive material sheet and a photographic developing solution are laminated and the peripheral edge portion is sealed from the outside, a hot melt adhesive layer, a resin film, an aluminum metal layer, a resin film, and a white pigment And a white surface layer made of a polymer binder.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a monosheet type instant photographic film of the present invention, and FIG. 2 is a cross-sectional view of its II plane. Hereinafter, the monosheet type instant photographic film of the present invention will be described with reference to these drawings.
The monosheet instant photographic film 10 of the present invention comprises a negative photographic photosensitive material sheet 11, a positive photographic photosensitive material sheet 12, a photographic photosensitive material laminate comprising a developing solution encapsulant 13, and a frame 20.
The negative photographic material sheet 11 has a color image providing element (cyan dye developer layer, red / negative emulsion layer, spacer layer, yellow dye developer layer, blue / negative emulsion layer on a light-shielding support. And in the order of the protective layer). Further, the positive photographic material sheet 12 is provided with a polymer acid layer, a neutralization timing layer, and an image receiving layer in this order on a transparent support.
[0013]
The negative photographic light-sensitive material sheet 11 and the positive photographic light-sensitive material sheet 12 are in a half-contact state through a space 15 for developing a photographic developing solution so that the color image providing element and the image receiving layer face each other. Place with. Then, the photographic developing solution packaging 13 is disposed on one side surface of the negative photographic photosensitive material sheet 11 so that the photographic developing solution 14 can be poured into the space 15. The peripheral layer of the photosensitive material laminate thus configured is sealed from the outside by the frame 20 to form the monosheet type instant photographic film 10. At this time, the width of the frame that hides the peripheral edge of the positive photographic photosensitive material sheet is preferably in the range of 3 to 8 mm. If the width of the frame is smaller than 3 mm, an undeveloped white portion or a portion where bubbles remain may be seen. If it is larger than 8 mm, the photographic image becomes too small.
[0014]
After taking a picture, the mono sheet type instant photographic film 10 is fed out through a guide roller of the camera. At this time, the roller is crushed by the photographic developing solution packaging 13, and the photographic developing solution 14 is injected into the space portion 15 and developed in the space portion. The photographic processing solution contains potassium hydroxide and a light-shielding dye, and protects the color image-donating element (negative) from being exposed to light by being injected into the space and developed. In the color image donating element (negative) in which the developing solution has entered, the color image developer diffuses and development proceeds, and the dye developer corresponding to the color positive component reaches the image receiving layer 12 and dyes the image receiving portion. . During this time, the acid polymer in the image receiving layer diffuses slowly into the developing solution layer through the neutralization timing layer and decolorizes the light-shielding dye, so that the color image formed on the image receiving layer becomes gradually clearer. In this way, a color image is formed.
[0015]
A cross-sectional view of a representative embodiment of the frame of the present invention is shown in FIG. In the frame 20 of the present invention, a white surface layer 21 made of a white pigment and a polymer binder, a resin film layer 22, an aluminum metal layer 23, a resin film layer 24, and an adhesive layer 25 are laminated in order from the top (outer side). It is a laminated sheet. The thickness of this frame is desirably in the range of 30 to 60 μm. When the thickness of the frame 20 is less than 30 μm, the mechanical strength is low, and the frame is easily damaged when a monosheet type instant photographic film is manufactured. On the other hand, if the thickness of the frame 20 is thicker than 60 μm, the step between the photographic image portion and the frame becomes large and the frame may be easily peeled off.
The white surface layer 21 contains a white pigment and a polymer binder as main components. The white pigment is usually selected from inorganic pigments, but the material is not particularly limited. For example, a commonly used material such as titanium oxide may be used. The polymer binder is selected from vinyl chloride-vinyl acetate copolymer, acrylic polyol, nitrocellulose, polyamide and the like, and vinyl chloride-vinyl acetate copolymer and polyamide are desirable. Further, it is desirable to add silica to the white surface layer in order to improve the writing property of the white surface layer.
[0016]
The aluminum metal layer 23 is preferably deposited and deposited on the resin film layer 24. Even when the aluminum metal layer laminated by vapor deposition is thinned, sufficient moisture resistance is secured. If the deposited aluminum metal layer has a thickness of 400 mm or more, sufficient concealability and moisture resistance can be obtained.
[0017]
The material of the resin film layers 22 and 24 is desirably the same in terms of cost, and is preferably a polyester resin that is transparent and has high mechanical strength in order to improve the whiteness of the surface. Examples of such a polyester-based resin include polyethylene terephthalate. In addition, if the thickness of each resin film is in the range of 10 to 15 μm, it is desirable because sufficient mechanical strength can be obtained. The difference in thickness between the resin films is preferably 2 μm or less. When the difference in thickness is 2 μm or more, the frame is easily curled. For example, when the frame is heated, the frame curls on the thinner surface of the resin film layer.
[0018]
The adhesive used for the adhesive layer 25 is preferably a hot melt adhesive. Examples of hot melt adhesives include ethylene-vinyl acetate copolymers, ethylene-acrylic acid ester copolymers, and polyvinyl acetate that have been widely used. By using a hot-melt adhesive, the frame (laminated sheet) can be stored in a rolled state. When manufacturing a monosheet type instant photograph, by heating the frame 20, the frame adheres to the photosensitive material laminate and seals the periphery of the photosensitive material laminate from the outside.
[0019]
Next, the manufacturing process of the frame of the present invention will be described. On one surface of the resin film (corresponding to 24 in FIG. 3), an aluminum metal layer (corresponding to 23 in FIG. 3) is laminated by vapor deposition. Aluminum is vapor-deposited by a general vacuum vapor deposition method, but the vapor deposition conditions for the aluminum vapor deposition layer are not particularly limited.
Next, a resin film (corresponding to 22 in FIG. 3) is bonded to the surface of the laminated aluminum metal layer. This resin film is bonded by a generally used laminating method. For example, any method such as dry laminating or wet laminating causes no problem.
On one resin film surface of the laminated sheet having the three-layer structure thus obtained, a coating liquid mainly composed of a white pigment and a polymer binder is applied and dried to obtain a white surface layer (in FIG. 3). 21). On the other resin film surface, a hot melt adhesive is applied and dried to laminate an adhesive layer (corresponding to 25 in FIG. 3). Either the white surface layer or the adhesive layer may be laminated first.
[0020]
【Example】
Example 1
(Create frame)
A frame having the structure shown in FIG. 3 was prepared as follows.
An aluminum metal layer (corresponding to 23 in FIG. 3) having a thickness of 700 to 800 mm was laminated on one surface of a resin film (corresponding to 24 in FIG. 3) made of polyethylene terephthalate having a thickness of 12 μm by vapor deposition.
Subsequently, a resin film (corresponding to 22 in FIG. 3) made of polyethylene terephthalate having a thickness of 12 μm was bonded to the surface of the laminated aluminum metal layer by a dry laminating method.
On one resin film surface of the thus obtained three-layer laminate sheet, a surface layer material application in which titanium oxide, silica and vinyl chloride-vinyl acetate copolymer are mixed at a weight ratio of 30: 1: 60, respectively. The liquid was applied and dried to form a white surface layer (corresponding to 21 in FIG. 3). Further, a hot melt adhesive mainly composed of an ethylene-vinyl acetate copolymer was applied to the other resin film surface to laminate an adhesive layer (corresponding to 25 in FIG. 3).
The laminate sheet thus obtained was cut into a predetermined shape as shown in FIG. 1 to create a frame.
[0021]
(Creation of mono sheet type instant photographic film)
The frame obtained as described above is arranged so as to seal the peripheral portion of the photosensitive material laminate comprising the positive type photographic photosensitive material sheet, the negative type photographic photosensitive material sheet, and the photographic developing solution encapsulating body from the outside. did. Next, the frame was heated and adhered to the photosensitive material laminate to produce the monosheet type instant photographic film shown in FIG.
[0022]
【The invention's effect】
In the frame of the present invention, since the white surface layer is laminated on the aluminum metal layer via the resin film, the white surface layer is hardly peeled off and the whiteness is improved. Moreover, since an aluminum metal layer is protected by the resin film, it becomes difficult to get a damage | wound. Therefore, in the monosheet type instant photographic film using the frame of the present invention, a photographic image can be seen more clearly, and even if the sheet is filled with a writing instrument, it is difficult to be damaged. Further, since the aluminum metal layer is hardly damaged when the white surface layer is applied, the productivity of the frame is also improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a monosheet instant photographic film of the present invention. FIG. 2 is a cross-sectional view of an example of a monosheet instant photographic film of the present invention. Sectional view [Figure 4] Cross-sectional view of an example of a commonly used frame [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Mono sheet type instant photographic film 11 Negative type photographic photosensitive material sheet 12 Positive type photographic photosensitive material sheet 13 Photo developing processing liquid inclusion body 14 Photo developing processing liquid 15 Space part 20 Frame 21 White surface layer 22 Resin film layer 23 Aluminum metal Layer 24 Resin film layer 25 Adhesive layer

Claims (4)

Mono-sheet type comprising a positive-type photographic photosensitive material sheet, a negative-type photographic photosensitive material sheet, a photosensitive material laminate comprising a photographic developing solution-encapsulating body, and a frame for sealing the peripheral edge of the laminate from the outside An instant photographic film, in which the frame is laminated in order from the inside, an adhesive layer, a resin film layer, an aluminum metal layer, a resin film layer, and a white surface layer made of a white pigment and a polymer binder A mono-sheet type instant photographic film comprising a sheet. 2. The monosheet type instant photographic film according to claim 1, wherein the two resin film layers of the frame are layers made of a polyester resin. The mono-sheet type instant according to claim 1 or 2, wherein the two resin film layers of the frame each have a thickness in the range of 10 to 15 µm, and a difference in thickness between them is 2 µm or less. Photo film. A frame in which a photographic light-sensitive material sheet and a photographic processing solution are laminated and the peripheral edge portion is sealed from the outside, comprising an adhesive layer, a resin film layer, an aluminum metal layer, a resin film layer, and a white pigment and a polymer binder A frame comprising: a laminated sheet in which a white surface layer is sequentially laminated.

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