Self-processing photographic film unit with dissolvable trap member

Abstract

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.

Dependencies are inferred from the claim text.