Special receptacle or package – For roll or reel – Flaccid wrapper
Reexamination Certificate
2000-12-26
2003-09-16
Luong, Shian (Department: 3728)
Special receptacle or package
For roll or reel
Flaccid wrapper
C206S413000
Reexamination Certificate
active
06619478
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a continuous photosensitive web having a leader portion and further relates to a light-shielding packaging for a roll of the photosensitive web.
BACKGROUND OF THE INVENTION
A light-shielding packaging for a roll of continuous photosensitive web wound on a core having on its each end a light-shielding flange disc is known and actually utilized, particularly, for the purpose of roomlight loading of a roll of continuous photosensitive web into a camera or other image-forming apparatus in which the photosensitive web is to be exposed.
European Patent Application No. 0 181 417 A1 (issued on May 21, 1986) discloses a packaging of rolls of light-sensitive material such as strip of photographic film or paper, for roomlight loading. The packaging comprises opaque material which protects the rolled material from light while leaving a leader of the rolled material exposed and which an be torn by pulling on such leader to cause the light-sensitive material to commence unwinding from the roll. A piece of heat-shrinkable sheet material is used together to cover the leader as well as a portion of the light-sensitive material.
U.S. Pat. No. 4,733,777 (issued on Mar. 29, 1988) and European Patent Specification 0 230 057 B1 (issued on May 16, 1990) both disclose a light-tightly packaged roll of light-sensitive material, which comprises an annular end cover for each end face of the roll and a circumferential cover wound around the periphery of the roll and having lateral extensions sealed with their inner surface to the inner surface of radially outwardly projecting margins of the end covers.
U.S. Pat. No. 4,911,299 (issued on Mar. 27, 1990) discloses a strip of light sensitive material wound in a coil onto an open-ended core which is packaged in tearable light tight wrapping material protecting the rolled web while leaving an exterior end of the coil exteriorly accessible. The light tight wrapping material is tearable by pulling on the exterior end to commence unwinding of the coil from the core.
European Patent Application 0 681 212 A1 (issued on Nov. 8, 1995) and U.S. Pat. No. 5,472,089 (issued on Dec. 5, 1995) both disclose a light-tight packaging for photosensitive web roll having a flexible leader portion that overlaps the outermost first convolution of the roll. The leader has three stretchable segments in which can cooperate with light-shielding flange portions to form light-tight labyrinth-type sealing.
Thus, for the purpose of satisfactory light-tight sealing, known packagings for photosensitive web utilize overall light-shielding sealing which is tearable or releasable from the flange when the leader is pulled to commence unwinding of the photosensitive web, or structural sealing such as labyrinth-type sealing.
SUMMARY OF THE INVENTION
The present invention has an object to provide a new light-shielding packaging system for a roll of continuous photosensitive web wound on a core having an its both ends a light-shielding flange disc.
The invention further has an object to provide a continuous photosensitive web having a light-shielding leader sheet, which is favorably employable for the new light-shielding packaging system.
The invention furthermore has an object to provide a continuous photosensitive web having a light-shielding leader which shows a high dimensional stability at surrounding temperatures which the photosensitive web sometimes encounters.
The present invention resides in a continuous photosensitive web having at least at one end thereof a light-shielding leader sheet which comprises a longitudinal light-shielding base sheet and a pair of heat-shrinkable light-shielding strips, in which each of the heat-shrinkable light-shielding strips is tearable predominantly in a longitudinal direction thereof and is fixed onto a surface of each side of the light-shielding base sheet under the condition that the light-shielding strip is aligned in parallel with the side of the longitudinal base sheet to project a portion thereof from the side of the base sheet.
The invention further resides in a light-shielding packaging for a roll of continuous photosensitive web wound on a core having on each end thereof a light-shielding flange disc, which has at a leading end thereof a light-shielding leader sheet which comprises a longitudinal light-shielding base sheet and a pair of heat-shrinkable light-shielding strips, in which each of the light-shielding strips is tearable predominantly in a longitudinal direction thereof and is fixed onto a surface of each side of the light-shielding base sheet under the condition that the light-shielding strip is aligned in parallel with the side of the longitudinal base sheet to project a portion thereof from the side of the base sheet, said leader sheet having a length larger than the length of the outermost convolution of the roll and a width larger an the distance between the outer face of one flange disc and the outer face of another flange disc, and each strip attached to the leader sheet being light-tightly fixed via heat shrinkage and fusion thereof onto the outer face of the flange disc at least at a portion adjacent to the periphery of the flange disc.
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Fukugawa Masafumi
Inoue Akihisa
Kadota Norihiro
Nakatogawa Koichi
Fuji Photo Film Co. , Ltd.
Luong Shian
Sughrue & Mion, PLLC
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