JPS6291940A - Self-processing photographic film unit - Google Patents

Abstract

PURPOSE:To provide a titled unit in which the surer cost reduction is possible than with the conventional unit by using an inexpensive plastic net in place of a woven nylon fabric heretofore used to form a trap member. CONSTITUTION:A base 24 for a neutralizing layer is bound via a laminated PE layer 23 to a water absorptive layer 22 consisting of, for example, filter paper, woven fabric, water absorptive polymer, etc. to form the trap member 21. A resin 25 for alkaline neutralization is stuck on the base 24 by coating or impregnation, etc. The plastic net 27 is bound via the laminated stripe-shape layer 26 consisting of, for example, PE with the above-mentioned resin 25. The base 24 is formed of, for example, raw paper, plastic film, woven fabric, etc. The resins which are heretofore used for the conventional trap member are usable as the resin 25. A PE net, etc. are used for the plastic net 27.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a self-processing photographic film unit used in an instant camera, etc., and more specifically, to a self-processing photographic film unit used in an instant camera etc. The present invention relates to an improved self-processing photographic film unit.

(Prior Art) A self-processing photographic film unit, generally referred to as an instant film, usually includes a film sheet 1 in which a photosensitive layer is formed and a cover sheet 2, as shown in FIG.
, a connecting member 3 that connects these sheets 1 and 2 in a state where they are smaller than each other, and a developing processing solution (hereinafter simply referred to as "processing solution 1'") stored at one end of the film sheet 1. It is comprised of a processing liquid container 4 and stages 1 to 5 disposed at the other end of the film sheet 1 for discharging excess processing liquid.

The connecting member 3 is made of an intermediate sheet 1 or a tape, and has an opening 3a defining an image forming area. Therefore, if J5 is located at this frontage 3a and between both sheets 1.2, there is a processing l! I! A space for liquid development is formed. After the film sheet 1 is exposed, when the film unit 10 is passed between the pair of processing liquid spreading rollers from the end on the processing liquid container 4 side, the processing liquid container 4 is torn open and the processing liquid container 4 is stored therein. The processing liquid is spread in the space with a uniform thickness. The photographic latent image formed on the film sheet 1 is developed by the processing liquid thus developed. The surplus processing liquid that is still pushed out from the unit 1 to the after-gas side (the straw trap means 5 side) even after being spread in the space is captured by the trap means 5.

Above) The trap means (e) instantly captures excess processing liquid.
It is necessary to have a space for this purpose, and also to have the ability to neutralize excess alkaline processing liquid. Conventionally, trapping means for this purpose involves fixing a nylon fabric that forms a space for capturing excess processing liquid to a water absorption layer formed from a filter paper basin and absorbing processing liquid, and then applying a neutralizing resin to this woven fabric. Many have been used in which the impregnated parts 1 to 3 are enclosed by the ends of the coupling member 3 described in 1ja.

However, the above-mentioned stages 1 to clap are expensive because the nylon woven fabric has a relatively high 111iI.
This has been a factor hindering cost reduction of self-processing photographic film units.

(Object of the Invention) The present invention has been developed in view of the above circumstances, and an object thereof is to provide a self-processing photographic film unit in which a trap means for trapping surplus processing liquid can be formed at low cost. That is.

(Structure of the Invention) The self-processing photographic film unit of the present invention is a self-processing photographic film unit comprising a film sheet as described above, a cover sheet, a connecting member, a processing liquid container, and a trap means. The trapping means includes a water absorption layer, a neutralization layer base bonded to the water absorption layer, a processing liquid neutralization resin attached to the base, and a plastic net bonded to the neutralization resin. The device is characterized in that it is configured to include a trap member.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows a self-processing photographic film unit 10 according to one embodiment of the invention, and FIG. 2 shows the trap means 5 of this film unit 10 in detail. This film unit 10 is formed in the same manner as the conventional product except that the trap means 5 is different from the conventional one, and includes the film sheet 1, cover sheet 2, coupling member 3, and processing liquid container as described above. It is equipped with 4.

As shown in FIG. 2, the trap means 5 is constructed by folding back the end portion 3b (trap cover) of the bond g++'tA 3, which is formed longer than the film sheets 1 to 1 and the cover sheet 2, toward the center of the unit to form the space 2o. A band-shaped trap member 21 is housed in this space 20. The above gap 20 on J3 joins the trap cover 3b to the cover sheet 2 by connecting the trap cover 3b to the cover sheet 2 by connecting the trap cover 3b to the cover sheet 2 at the outside of both side ends (left and right ends in FIG. 1) of the trap member 21. It is defined by being joined to the cover sheet 2. Further, the trap cover 3b is provided with a small exhaust hole 6 on the number-of-stages side, which communicates the space 20 defined as described above with the outside.

The trap members 21 are disposed over the booth openings 2a formed side by side at the end of the cover sheet 2, and the cover sheet 2 and the connecting member 3 are not directly joined at this end. Therefore, when the processing liquid is opened between the film sheet 1 and the cover sheet 2 as described above, the excess processing liquid flows into the gap between the cover sheet 2 and the connecting member 3, and the small opening 2a. It penetrates into the space 20 through.

Next, the trap member 21 will be explained in detail with reference to FIG. A neutralization layer base 24 is connected to the polyethylene laminate 1 via a hole 23 to one water absorption hole 22 made of, for example, filter paper, woven fabric, water-absorbing polymer, or the like. This neutralizing layer base 24 is coated with an alkaline intermediate phase resin 25 by coating or dipping. Further, a plastic net 21 is bonded to the neutralizing resin 25 via a striped laminate layer 26 of polyethylene, for example.

The base 24 for the neutralizing layer is formed from, for example, base paper, plastic film, woven fabric, or the like. Also, neutralizing resin 25
For example, methyl cellulose containing phosphoric acid, or copolymer containing carboxylic acid (acid polymer) '6,
Those used in trap members of conventional self-processing photographic film units may be used. The plastic net 27 may be a polyethylene net (for example, Netron (trade name) manufactured by Dainippon Plastics Co., Ltd.) or a polypropylene net such as KDN-11 (trade name) manufactured by Dainippon Plus Deck Co., Ltd. As mentioned above, such a plastic net 27 is cheaper than the nylon woven fabric used in the 1-wrap means of a conventional self-processing photographic film unit. Since it is impossible to directly impregnate the neutralizing resin as in Neuron Woven I, in film units 1 to 10, d3 is
A base 24 for the neutralizing layer is set up as shown in (), and a neutralizing resin 25 is attached thereto.

In the film unit 10 equipped with the trap means 5 including the trap part + A21 having the above-mentioned configuration, when the extra prick treatment liquid enters the space 20 as described above, the treatment liquid (and the space between the plastic net 27 It will be instantly captured by the alkaline Fi!
The liquid is neutralized by the neutralizing resin 25. In addition, the polyethylene laminate layer 23 allows the processing liquid to pass through the trap member 21.
This prevents the gas from penetrating inside and proceeding to the exhaust hole 6 side. The water-absorbing layer 22 absorbs the processing liquid that has flowed around the polyethylene laminate layer 23 in the direction shown in FIG.

J5 In this film unit 10, as shown in above, a processing liquid trapping space is formed by the plus deck net 27, so that the net 27 is combined with the neutralizing resin 25. The striped laminate layer 26 must be formed with a stripe width and spacing that does not impair the processing liquid trapping space.

(Effects of the Invention) As explained in detail above, the self-processing photographic film unit of the present invention uses
Since the trap member is formed using an inexpensive plastic net, the cost can certainly be reduced compared to conventional products.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a self-processing photographic film unit according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the vicinity of the trap means of the film unit in detail. 1...Film sheet 2...Cover sheet 3.
...Connection member 3b...Trap cover 4.
...Treatment liquid container 5...Trap means 10...
・Film unit 20...Space 21...1 to wrap member 22...Water absorption layer 23...Polyethylene laminate layer 24...Base for neutralizing layer 25...Resin for neutralization 2
6...Stripe-like laminate layer 21...Plastic net Figure 1 → Figure 2 8 Contents of amendment (voluntary) Hand-written by the Commissioner of the Patent Office June 5, 1986 1. Indication of the case Patent Application No. 13/1988 2. Name of the invention Self-processing photographic film unit 1-3. Relationship with the proposed case Patent applicant Address 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Name Name
Fuji Photo Film Co., Ltd. 4, Agent: 7th floor, Uraiya Building, 5-2-1 Roppongi, Minato-ku, Tokyo. 5. Date of amendment order None 6. Cause of invention increased by amendment None 7. Response to amendment ``Detailed description of the invention'' and 1. Brief description of drawings'' column of the description, and drawing 1) Insert ``through the polyethylene laminate'' in front of ``1 surplus processing liquid trapping space'' on page 3, line 19 of the specification. 2) Page 5, line 19 [1] Fix the wrap member 21 after J with 1 adhesive 28. 3) Page 6, lines 5 and 6, ``Definition I is corrected to ``formation.'' 4) IOI, page 8, line 14, "Prevents the attack of 5) Insert "28...
Insert the adhesive. 6) In the drawings, Figure 2 has been corrected as shown in the attached sheet. 9. Attached audience

Claims (1)

[Scope of Claims] A film sheet having a photosensitive layer, a cover sheet, a connecting member that connects the cover sheet and the film sheet in an overlapping state, and one end portion of the film sheet that stores a developing processing solution. A self-processing photographic film unit comprising a processing liquid container disposed at the edge of the film sheet, and a trap means disposed at the other end of the film sheet for capturing excess developing processing liquid, wherein the trap means includes a water absorbing layer and the water absorbing layer. It is characterized by including a trap member consisting of a neutralizing layer base bonded to the layer, a treatment liquid neutralizing resin attached to the base, and a plastic net bonded to the neutralizing resin. A self-processing photographic film unit.