US 6,100,017 AGranted

Roll photo film having seal tape

AssigneeFuji Photo Film Co., Ltd.

InventorsTeruyoshi Makino, Toshiyuki Takeya

Life of this patent

Estimating the term…

Loading patent…

Abstract

A 120-type roll photo film has a photo filmstrip. Trailer and leader portions of backing paper project from respective ends of the photo filmstrip. The photo filmstrip is wound about a spool with the trailer and leader portions. A seal tape is previously secured to the trailer portion. The photo filmstrip, after being exposed, is wound with the trailer and leader portions in a form of a roll with the leader portion internally positioned. Then the seal tape is fitted on the roll for preventing the trailer portion from being unwound. In the seal tape, a support material has first and second ends and an intermediate portion. The support material is folded into three in a Z-shape along first and second fold lines located between the intermediate portion and each of the first and second ends. A first adhesive layer attaches the first end to the trailer portion. An auxiliary adhesive layer attaches the intermediate portion to the first end in a peelable manner. A second adhesive layer is overlaid on the second end, and confronts the intermediate portion. A release layer is overlaid on the intermediate portion, receives the second adhesive layer, and facilitates peeling of the second adhesive layer from the intermediate portion. When the second end is separated from the intermediate portion, the support material is unfolded. The second adhesive layer attaches the second end to the trailer portion.

Claims26

Dependent claims

A roll photo film, including a photo filmstrip having a rear end and a front end, a light-shielding trailer portion and a light-shielding leader portion located to project respectively from said rear end and said front end, a spool on which said trailer portion is mounted, and about which said photo filmstrip is wound in a first direction to form an unexposed roll with said trailer portion and said leader portion, and a seal tape secured to said trailer portion, wherein said photo filmstrip, after being exposed, is wound in a second direction with said trailer portion and said leader portion forming an exposed roll with said leader portion internally positioned, and said seal tape being secured to said exposed roll for preventing said trailer portion from being unwound, said roll photo film comprising:

said seal tape including:
a support material having first and second end portions and an intermediate portion located therebetween;
first and second fold lines along which said support material is folded into three in a Z-shape or S-shape, said first fold line being disposed between said first end portion and said intermediate portion, and said second fold line being disposed between said second end portion and said intermediate portion;
a first adhesive layer for attaching said first end portion to said trailer portion;
an auxiliary adhesive layer for attaching said intermediate portion to said first end portion in a peelable manner;
a release layer overlaid on said intermediate portion;
and
a second adhesive layer, overlaid on said second end portion, for attaching to said release layer in a peelable manner, wherein said second adhesive layer, when peeled from said release layer, sets said second end portion attachable to said trailer portion with said support material unfolded along said first and second fold lines.

5 more elements

A roll photo film, including a photo filmstrip having a rear end and a front end, a light-shielding trailer portion, and a light-shielding leader portion located to project respectively from said rear end and said front end, a spool on which said trailer portion is mounted, and about which said photo filmstrip is wound in a first direction to form an unexposed roll with said trailer portion and said leader portion, and a seal tape secured to said trailer portion, wherein said photo filmstrip, after being exposed, is wound in a second direction with said trailer portion and said leader portion forming an exposed roll with said leader portion internally positioned, and said seal tape being secured to said exposed roll for preventing said trailer portion from being unwound, said roll photo film comprising:

a release layer overlaid on said trailer in a region close to an end of said trailer;
and
said seal tape including a support material having first and second end portions, and an intermediate portion located therebetween, and an adhesive layer overlaid on one face of said support material, wherein said seal tape is secured to said trailer portion by said adhesive layer with said intermediate portion mounted on said release layer, and before said seal tape is secured to said exposed roll, said intermediate portion and said second end portion are peeled from said trailer portion, adhesion between said first end portion and said trailer portion is strong enough for tight attachment therebetween, and adhesion between said second end portion and said trailer portion is strong enough for preventing peeling of said intermediate portion from said release layer during manufacture of said roll photo film.

Dependencies are inferred from the claim text.

Facts

Application: 09/257,261Filed 25 Feb 1999
Priority: JP 10-07737225 Mar 1998
Granted: 8 Aug 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G03B 17/305
Locating spools or other rotatable holders of coiled film: for roll film cameras
G03C 3/02
Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g.…:…
G03B 2217/261
Holders for containing light-sensitive material and adapted to be inserted within the camera: details of spools
G03B 2217/265
Holders for containing light-sensitive material and adapted to be inserted within the camera: details of light-proofing