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Self-processing-photographic-film-unit-with-dissolvable-trap-member

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Self-processing photographic film unit with dissolvable trap member

Details

Inventors: Hara, Yoshio; Ishino, Yoshiaki;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A self-processing photographic film unit includes a first sheet for recording a positive image, a transparent second sheet bonded to the first sheet in face-to-face relation, a container for a processing liquid coupled to the leading end of the film unit, and a trap coupled to the trailing end of the film unit. Following exposure of the film unit, the processing liquid is distributed uniformly between the sheets, and any excess of the processing liquid from an image-recording area of the first sheet is received in the trap. The trap comprises a bag-like trap cover having a plurality of air orifices and a trap member capable of swelling and solubilizing when in contact with the processing liquid, which is surrounded the trap cover. The trap member is made of a fibrous carboxymethylcellulose sheet or a fibrous carboxymethylcellulose sheet and filter paper bonded to each other by sandwiching a liquid impervious member therebetween. The trap member contains azelaic acid as a neutralization agent and a material discharging metal cations as a coagulation agent.

DETAILED DESCRIPTION An object of the present invention is to provide a self-processing photographic film unit in which, in order to prevent any leakage of a trapped processing liquid, the trap means is adapted to increase its available trapping capacity without increasing the thickness thereof.
Another object of the present invention is to provide a self-processing photographic film unit in which a trapped processing liquid in the trap means coagulates well.
Still another object of the present invention is to provide a self-processing photographic film in which a trapped processing liquid is neutralized to be unavailable.

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