Package of rolled phototsensitive material

Abstract: The invention relates to a package of rolled photosensitive mateiral comprising a core, a photosensitive strip material wound around the core, a light-shielding leader connected to the end of the photosensitive strip material to shield the peripheral surface of the photosensitive strip material from light and side light-shielding covers connected to both sides of the light-shielding leader so that the boundary between the side light-shielding covers and the light-shielding leader corresponds to the boundary between the peripheral surface and the side surface of the photosensitive strip material. The core is formed by laminating at least 2 sheets of a base paper being moistureproof. The side light-shielding covers are composed of a composite film having a polyethylene film having light-shielding ability and a uniaxially oriented film or a biaxially oriented film made of polyester, polyethylene polypropylene or nylon and the length of the side light-shielding covers being not less than twice as long as the outer periphery of a roll of the photosensitive strip material.

Description: BACKGROUND OF THE INVENTION The invention relates to a package of a rolled photosensitive material usable for loading in a light room. A package of a rolled photosensitive material usable for loading in a light room is loaded into a magazine in light-shielding state, and the light-shielding ability of the package is broken in the magazine, and a photosensitive strip material is extended through the slit of the magazine. The above mentioned conventional package of a rolled photosensitive material comprises a core, a photosensitive strip material wound around the core, a light-shielding leader connected to the leading end of the photosensitive strip material to shield the peripheral surface of the photosensitive strip material from light and a side light-shielding covers connected to both sides of the light-shielding leader so that the boundary between the side light-shielding covers and the light-shielding leader corresponds to the boundary between the peripheral surface and the side surface of the photosensitive strip material wherein the side-shielding covers are connected to the core. Such a conventional package is known from EP 0 414 265 A2 which corresponds to Japanese Utility Model KOKAI No. 3-77933 . The above mentioned conventional package is preferable because it can be made through very easy work and in a low cost. However, since the core is made of a usual paper holder, it is insufficient in moistureproofness resistant to temperature and moisture change during transportation or preservation. Then, moisture permeates into the package, and affects adversely the photographic properties of the photosensitive strip material A paper core consisting of a neutral paper is known from EP-A-436133. SUMMARY OF THE INVENTION An object of the invention is to provide a package of a rolled photosensitive material wherein moisture does not permeate into the package. This object is achieved by a package having the features of claim 1 and by a package having the features of claim 10. BRIEF DESCRIPTION OF THE DRAWING Figure 1 is a partly broken away perspective view of a package of a rolled photosensitive material of the present invention. Figure 2 is a partly broken away sectional view of a package of a rolled photosensitive material of the present invention. Figure 3 is a exploded perspective view of a package of a rolled photosensitive material of the present invention. Figure 4 is a partly sectional view illustrating a layer construction of a core of a package of a rolled photosensitive mateiral of the present invention. Figure 5 is a perspective view illustrating a state of extending a photosensitive strip material in a package of a rolled photosensitive material of the present invention. Figure 6 is a perspective view illustrating a state of extending a photosensitive strip material in a package of a rolled photosensitive material of the present invention. 10 Core 11 Base paper 20 Photographic paper (photographic strip material) 30 Light-shielding leader 40 Side light-shielding cover 41 Polyester film 42 Polyethylene film 50 End tape 60 Bush a Outer boundary of adhesion part s Adhesion part DETAILED DESCRIPTION OF THE INVENTION The core is formed by laminating at least 2 sheets of a base paper having moistureproofness. The base paper is not particularly limited so far as it does not adversely affect a photosensitive material to be wound. For example, as a pulp used for the base paper for paper core, chemical pulp such as SP and KP, semichemical pulp, such as CTMP and CGP, and mechanical pulp are usable, and waste paper of newspaper and waste paper of carbon are also usable. Preferable base papers for paper core are small generation of sulfur compound, formalin, etc. (for example, neutral paper described in Japanese Patent KOKAI No. 3-180583). These base papers may be used alone or in a combination thereof. The base paper for paper core is preferably 0.2-1.0 mm in thickness and 150-750 g/m 2 in areal weight. In order to prevent staining of the surface and peeling off at the cut end, decorative paper is preferably wound around the outermost layer. A preferable thickness of the decorative paper is 0.05-0.2 mm. In order to make the base paper moistureproof, a resin is coated on a surface of the base paper, a moistureproof film or a metallic foil is laminated onto the base paper, or the like. The coating resin may include polyethylene, polypropylene, etc., and the moistureproof film may include polyethylene film, polyvinylidene chloride film, metallized film, a silicated film, etc., and the metallic foil may include aluminum foil, iron foil, copper foil, etc. The water vapor permeability of the base paper having moistureproofness is preferably 1-20 g/m 2 • 24 hr particularly 1-10 g/m 2 • 24 hr, per one sheet according to JIS Z 0208 (40°C, 90 % RH). Besides, the core is composed of at least 2 sheets of the base paper. When the core is composed of only one base paper, it is difficult to ensure moistureproofness because moisture permeates the space between the base paper coiled in spiral. The side light-shielding covers may be formed of a composite film composed of a uniaxially oriented film or a biaxially oriented film, made of polyester, nylon, polyethylene or polypropylene, and polyethylene film having light-shielding ability. By using the composite film, drop strength and'abrasion resistance as well as heat sealing ability and tear strength are improved. Examples of the uniaxially oriented film or the biaxially oriented film made of polyester, nylon, polyethylene or polyplopylene include; polyesten Lumilar (Toray Ind. Inc.) Espet film (Toyobo Co., Ltd.) Enblet (Unitika Ltd.) nylon Harden film (Toyobo Co., Ltd.) Emblem (Unitika Ltd.) polyethylene Hybron film (Mitsui Toatsu Chemical Inc.) Variela film (Nisseki Plasto Co., Ltd.) polypropylene Taiko Fo (Nimura Sansho) Silphan (Gunze Sangyo Inc.) Pilen film-ST (Toyobo Co., Ltd.) An example of the polyethylene film having light-shielding ability is polyethylene film containing more than 0.1 wt. % of carbon black disclosed in Japanese Patent KOKOKU Nos. 2-2700, 2-2701. The side light-shielding cover may be composed of the composite film and the other film laminated thereonto. For example, a polyethylene film having light-shielding ability is laminated onto a biaxially oriented polyester film, and another polyethylene film having light-shielding ability is laminated onto the oriented polyester film side of the laminated film. The length of the side light-shielding cover should not be less than twice as long as the outer periphery of a photosensitive strip material, preferably from 2.1 times to 2.3 times that of the outer periphery. When the length is less than twice that of the above outer periphery, light-shielding ability and moistureproofness are insufficient at the part of only one round. The impact strength is also insufficient at the part of only one round for transportation. The light-shielding leader requires rigidity in some degree in order to advance the side light-shielding covers along the outside adhesion boundary in addition to light-shielding ability, moistureproofness and heat sealing ability. The rigidity required here is suitably selected according to the material and the thickness of the side light-shielding cover. However, the rigidity of the adhered side light-shielding cover is added to the above mentioned rigidity, and accordingly, the rigidity is not necessary to tear the side light-shielding covers by itself but sufficient more than the rigidity of side light-shielding covers. As the materials of the light-shielding leader, a polyethylene film having light-shielding ability, a polyester film having light-shielding ability, composite films composed of a uniaxially oriented film or a biaxially oriented film made of polyester, nylon, polyethylene or polypropylene and a polyethylene film having light-shielding ability laminated thereonto are usable. The light-shielding leader is longer than the side light-shielding covers and is used as the leader for extending the light-shielding leader out of the magazine, when the end of the light-shielding leader is loaded in the magazine. Besides, in order to facilitate joining the base end of the light-shielding leader with the photosensitive strip material in mechanical viewpoint, the light-shielding leader preferably is provided with margins at the forward end and the base end of the side light-shielding covers. Adhesion between the light-shielding leader and the side light-shielding cover is conducted by a method using ultrasonic, a heating bar, an impulse sealer, a heat roller, adhesive, an adhesion tape, or the like. When the outer boundary of the adhesion part is located at the side surface of the roll of the photosensitive strip material, not shearing force but tension acts during extending the light-shielding leader. Accordingly, resistance against tearing the side light-shielding cover increases. For this reason, the distance between the outer boundaries of both adhesion parts is preferably slightly narrower than the width of the photosensitive strip material in view of dimensional error, such as winding discrepancy occurring when the side light-shielding cover and the light-shielding leader are wound around the photosensitive strip material, and location slip occurring when the light-shielding leader is joined to the photosensitive strip material. However, if a dimensional error does not occur at manufacturing, the outer boundaries of the adhesion parts are preferably almost corresponding to the outer peripheral edges of the photosensitive strip material. Besides, both edges of the light-shielding leader preferably have non-adhered parts, because the outer boundaries of the adhesion parts are used for a accelerating line for tearing. The adhesion between the light-shielding leader and the photosensitive strip material preferably has a sufficient strength not to be peeled off, when the package is loaded into an apparatus. Moreover, when the light-shielding leader is extended, the adhesion has a peel strength capable of separating easily and completely between the end of the photosensitive strip material and the base end of the light-shielding leader. As the adhesion method, for example, there are some methods using ultrasonic, a heating bar, an impulse sealer, a heat roller, adhesive, an adhesion tape or the like. As the photosensitive strip material applicable to the package of a rolled photosensitive material of the invention, there are a photographic paper, a photographic film, etc. Photosensitive strip materials having 150-300 mm in outer diameter and 76-600 mm in width are preferable in view of its dimension. In the package of a rolled photosensitive material of the invention, the photosensitive strip material is packaged in a light-shielding state by the light-shielding leader and the side light-shielding covers, and at the time of extending the photosensitive strip material, the side light-shielding covers are torn along the adhesive boundary between the light-shielding leader and the side light-shielding cover. Moisture does not permeate through the core. In Figs. 1 to 3, the numeral 10 indicates a core having moistureproofness. As shown in Fig. 4, the base paper having moistureproofness used in the core 10 is composed of a base paper 11 for paper core, an ethylene resin layer 12 for adhesion, a biaxially oriented HDPE (high density polyethylene) film (Tonen Sekiyu Kagaku) 13 which may have 20 µm in thickness, an ethylene resin layer 12 for adhesion and a base paper 11 for paper core from the inside (the lower side in the figure). The core 10 is composed of the innermost two layers of the base paper having moistureproofness, preferably eight layers of the base paper for paper core laminated on the base paper layers and one uppermost layer of a decorative paper laminated on the base paper for paper core layer, and can be 76.2 mm in inside diameter, 86 mm in outside diameter and 117 mm in width. The moistureproofness preferably is 9 g/m 2 • 24 hr under the atmosphere at 40°C at 90 % RH. A photographic paper 20 as the photographic strip material is wound around the core 10 in a roll. The photographic paper 20 is formed of polyethylene laminated paper as the base material having 0.23 mm in thickness, 117 mmm in width and 180 m in length, and the outside diameter is 245 mm. An end 31 of the light-shielding leader 30 is adhered to the back side of the end 21 of the photographic paper 20 in a peel-free state by ultrasonic adhesion having 10 mm of a superimposed part. A notch 44 having a length of 5 mm is formed in order to ensure and facilitate opening at the forward end of the side light-shielding cover 40 at a distance of 2 mm toward the out side from the outer boundary of the adhesion part S. The light-shielding leader 30 is wound twice around photographic paper 20, and the leader part 36 of the end of the light-shielding leader is adhered to itself by an end tape 50. The end tape 50 is provided with a pick-up part 51 having a length of 10 mm on which adhesive is not coated in order not to injure the photographic paper 20 through the light-shielding leader 30 by nail or the like, during peeling of the end tape 50 (the handling part may be formed by folding an edge of the tape). Besides, the side light-shielding cover 40 is folded along the side surface of the rolled photographic paper 20, and the side edge 43 thereof is inserted into the core 10 and fixed by the insertion of a bush 60 into the core 10 with pressure. The bush 60 is made of paper, and is 74.4 mm in outside diameter, 69 mm in inside diameter and 40 mm in width. When the outside diameter of the bush 60 is d, the thickness of the side light-shielding cover 40 is t, the length of the side light-shielding cover 40 is 1 and the inside diameter of the core 10 is D, it is preferable to satisfy a relation of 0.6 ≦ tx1/(π/4x(D 2 -d 2 )) ≦ 0.9 particularly 0.7 ≦ tx1/(π/4x(D 2 -d 2 )) ≦ 0.8 A movement of extending the photographic paper from the package loaded in a magazine is explained. First, when the package is loaded in a magazine (not illustrated), as shown in Fig. 5, the tip of the light-shielding leader 13 is extended and projects from the slit of the magazine. When the light-shielding leader 30 is drawn in this state, force f pulling to the center acts on the notch 44 of the side light-shielding cover 40 in addition to a shearing force. As a result, the notch 44 is going to proceed diagonally inward direction b, but since the inner part from the notch 44 is connected to the light-shielding leader 30 resulting is the increase of the strength. Accordingly, the inward proceeding of the notch 44 is inhibited and consequently, the side light-shielding covers 40 are torn along adhesion outside boundaries. The adhesion part S of the light-shielding leader 30 and the side light-shielding covers 40 are extended out from the slit opening, and a not-adhered part of the side light-shielding covers 40 remain on the sides of the photographic paper 20. Moreover, when the light-shielding leader 30 is completely extended from the slit opening, as shown in Fig. 6, the light-shielding leader 30 is completely separated from the side light-shielding covers 40, and resistance to rotating the photographic paper 20 is removed.

Claims: A package of rolled photosensitive material comprising a core (10), a photosensitive strip material (20), wound around the core (10), a light-shielding leader (30) connected to the end of the photosensitive material to shield the peripheral surface of the photosensitive material (20) from light and side shielding covers (40) connected to both sides of the light-shielding leader (30) so that the boundary between the side light-shielding covers (40) and the light-shielding leader (30) corresponds to the boundary between the peripheral surface and the side surface of the photosensitive strip material (20), wherein the side-shielding covers (40) are connected to the core (10), characterized in that said core (10) is formed of at least two laminated sheets of a moisture proof base paper, wherein a resin is coated on a surface of the base paper and a moisture proof film or a metallic foil is laminated onto the base paper. The package according to claim 1 wherein said base paper is formed of a member selected from the group consisting of chemical pulp, semichemical pulp or mechanical pulp. The package according to claim 1 wherein said base paper is 0.2 to 1.0 mm in thickness. The package according to claim 1 wherein said base paper is 150-750 g/m 2 in areal weight. The package according to claim 1 wherein watervapor permeability of said base paper is 1-20 g/ m 2 •24 hr per one sheet. The package according to claim 1 wherein the outside diameter of the bush d, the thickness of the side light-shielding cover t, the length of the side light-shielding cover 1 and the inside diameter of the core D satisfy a relation of The package to according at least one of the proceeding claims wherein the coating resin includes polyethylene and polypropylene. The package according to at least one of the proceeding claims wherein the moisture proof film includes polyethylene film, polyvinylidene chloride film, metallized film and silicated film. The package according to at least one of the proceeding claims wherein the metallic foil includes aluminum foil, iron foil and copper foil. A package of rolled photosensitive material comprising a core (10), a photosensitive strip material (20), wound around the core (10), a light-shielding leader (30) connected to the end of the photosensitive material to shield the peripheral surface of the photosensitive material (20) from light and side shielding covers (40) connected to both sides of the light-shielding leader (30) so that the boundary between the side light-shielding covers (40) and the light-shielding leader (30) corresponds to the boundary between the peripheral surface and the side surface of the photosensitive strip material (20), wherein the side-shielding covers (40) are connected to the core (10), characterized in that said core (10) is formed of at least two laminated sheets of a moisture proof base paper, wherein the moisture proof base paper used in the core (10) is composed of a base paper (11), an ethylene resin layer (12) for adhesion, a biaxially oriented HDPE film, an ethylene resin layer (12) for adhesion and a base paper (11). The package according to claim 10 wherein the HDPE film has a thickness of 20 µm.

Inventors: KUDO KOJI, MINO SATOSHI, OSANAI HIROYUKI, SHIMIZU SHIGEHISA, TAKAHASHI HISASHI, KUDO, KOJI, MINO, SATOSHI, OSANAI, HIROYUKI, SHIMIZU, SHIGEHISA, TAKAHASHI, HISASHI
Applicants: FUJI PHOTO FILM CO LTD, FUJI PHOTO FILM CO., LTD.
Application year: 1993
Main classification: G03C3
IPC codes: G03C3