Sheet film package
AssigneeFuji Photo Film Co., Ltd.
InventorsKatsumi Tashiro, Hitoshi Komiyama, Yoshio Hara
Life of this patent
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Abstract
A sheet film package contains a sheet film unit in a light-shielding envelope with an open end through which the sheet film unit is movable into and out of the light-shielding envelope. The light-shielding envelope is formed by folding a sheet of light-tight material in half to provide a folded side, and securely sealing joints of the folded sheet along a side opposite side to the folded side as well as an end opposite to the open end, wherein a middle portion of the folded side has a larger folding angle compared with end portions thereof.
Claims15
In a sheet film package comprising a light-shielding envelope having an open end, and a sheet fill unit movable into and out of said light-shielding envelope through said open end, said sheet film unit comprising a sheet of photographic film and a sealing clip for openably sealing said open end of said light-shielding envelope in a light-tight fashion when said sheet fill unit is contained in said light-shielding envelope, the improvement wherein:
- said light-shielding envelope is formed by folding a sheet of light-tight material in half to provide a folded side and securely sealing joints of said folded sheet along a side opposite to said folded side and in an end opposite to said open end, said folded side having a larger folding angle in a middle portion thereof compared with end portions of said folded side.
A method of manufacturing a sheet film package comprising a light-shielding envelope having an open end, and a sheet film unit movable into and out of said light-shielding envelope through said open end, said sheet film unit comprising a sheet of photographic film and a sealing clip for openably sealing said open end of said light-shielding envelope in a light-tight fashion when said sheet film unit is contained in said light-shielding envelope, said method comprising the steps of:
- folding a sheet of light-tight material in half to provide a folded side;
- sealing joints of said folded sheet along a side opposite to said folded side and in an end opposite to said open end in a light-tight fashion;
- and
- pressing said folded side so as to have a larger folding angle in a middle portion thereof compared with end portions of said folded side.
Dependencies are inferred from the claim text.