JPH0733236Y2 - Double packaging bag for photographic material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a double packaging bag for a photographic light-sensitive material, which is suitable for packaging a relatively heavy weight of various photographic light-sensitive materials, such as a roll film for movies. It is a thing.

[Conventional technology]

Generally, for a photographic light-sensitive material that loses its quality value when exposed to light, a packaging bag that completely blocks light is used. In addition to the above light-shielding properties, this packaging bag has photographic properties, gas barrier properties, moisture resistance, physical strength (breaking strength, tear strength, impact piercing strength, gelbotest strength, abrasion strength, etc.), heat seal suitability (heat seal strength, cut strength). It is required to satisfy various characteristics such as sealing property, hot tack property, foreign substance sealing property, etc.), antistatic property, lubricity, low dust generation property and flatness.

Conventionally, as a laminated film used for such a packaging bag, there has been one as shown in FIGS. 6 and 7.

The laminated film shown in FIG. 6 is a thermoplastic resin foam sheet.
It is a film in which a light-shielding molecular orientation film 6a is laminated on both surfaces of 11 with an adhesive layer 3 interposed therebetween (JP-A-59-201848).

The laminated film shown in FIG. 7 is a low-density polyethylene (hereinafter referred to as LDPE) resin film 12 to which a light-shielding substance is added.
a, a metal foil 9, and a flexible sheet 15 such as paper, cellophane, or synthetic resin film are laminated via a thick LDPE resin extrusion lamination adhesive layer 3 of 40 μm.

[Problems to be solved by the device]

However, the conventional packaging bag made by heat-sealing a laminated film is bulky, rigid, and expensive, but when used as a packaging bag of a photographic light-sensitive material having a weight of 1 kg or more, it is packaged during transportation. There was a problem that the most important quality of the packaging bag for photographic photosensitive materials such as moisture resistance, photographic property, gas barrier property, light shielding property, dimensional stability, etc. could not be secured because the bag broke near the corner of the photographic photosensitive material. .

Further, when paper is used as a material, a paper strength enhancer such as melamine / formalin resin, which has a bad influence on the photographic light-sensitive material, cannot be used, which causes a problem of dust generation.

Further, the laminated film disclosed in JP-A-59-201848 has excellent tear resistance and impact puncture strength and also has impact resistance, so that it was put into practical use as a reinforced light-shielding bag replacing a metal can. Since a uniaxial molecular oriented film with almost the same high softening point is used on the back, the heat sealing suitability is poor and the sealing strength is low, and a heat resistant film or Teflon tape is placed between the laminated film and the heat sealer on the heat sealer side. If you do not do so, it will melt and rupture and light shielding
The hermeticity could not be secured.

The present invention solves the above problems, has a large physical strength even if the thickness is thin, has good suitability for bag making, has excellent moisture resistance, photographic properties, gas barrier properties, impact punching strength, burst strength, etc., and is inexpensive. An object of the present invention is to provide a double packaging bag for a photographic light-sensitive material.

[Means for Solving the Problems]

The present invention has been made to achieve the above object,
It has an inner laminated film and an outer laminated film, and the inner laminated film has an aluminum vacuum deposition molecular orientation film having a thickness of 5 to 60 μm and a pH of 5 to 5 laminated on both surfaces thereof.
9. A light-absorbing, light-shielding thermoplastic resin film containing furnace carbon black having an average particle size of 10 to 200 mμ, wherein the outer laminated film is an aluminum vacuum vapor-deposited biaxially stretched film having a thickness of 5 to 60 μm, and both sides thereof. Consisting of a laminated light-shielding thermoplastic resin film, the inner and outer surfaces of the inner laminated film and the inner surface of the outer laminated film each have a heat-sealing property, and the outer surface of the outer laminated film has low dust emission, The biaxially-stretched filter of the aluminum vacuum-deposited biaxially-stretched film has a stretching ratio of 1.5 times or more.

The double packaging bag for a photographic light-sensitive material of the present invention is a packaging bag having a double structure formed of an inner laminated film and an outer laminated film.

As the light-absorbing light-shielding thermoplastic resin film constituting the inner laminated film, a thermoplastic resin film containing a light-shielding substance, for example, various polyethylene resins, ethylene copolymer resins, polypropylene resins, polybutene resins,
Polyvinylidene chloride resin, polycarbonate resin, polyvinyl chloride resin, polyamide resin, polyester resin,
There are known resin films such as polystyrene resins and modified resin films thereof.

Among them, various polyethylene resins such as high density, medium density, low density and linear low density polyethylene, polyolefin resins such as polypropylene resin and polybutene resin, ethylene-propylene copolymer resin, ethylene-butene copolymer resin, ethylene A film of a polyolefin resin such as an acrylic ester copolymer resin or an ethylene-vinyl acetate copolymer resin is preferable, and a linear low density polyethylene (hereinafter referred to as L-LDPE) resin film is particularly preferable. By kneading with a plastic resin film, heat sealability and physical strength can be improved.

The L-LDPE resin is called a third polyethylene resin, and is a low-cost, high-strength resin that meets the demands of the times of energy saving and resource saving, which have the advantages of both middle and low density polyethylene resins. This resin has ethylene and 3 to 13 carbon atoms, preferably 4 to 10 carbon atoms by the low pressure method or the high pressure improvement method.
It is a copolymer of a number of α-olefins and is a low-to-medium density polyethylene resin having a linear straight chain with short branches.

As the α-olefin, butene-1, octene-1, hexene-1, 4-methylpentene-1, heptene-1,
Etc. are used, the density is generally lower middle density polyethylene with a resin around taken by that Whereas commercial products 0.87~0.95g / cm ^3, most common L-LDPE resin 0.90~0.94g / cm ³
Many are within the range. The L-LDPE resin having a density of 0.919 to 0.930 g / cm ³ can be preferably used in the present invention. Specific examples of this L-LDPE resin are G resin, TUFLIN, NUC-FLX (UCC Company) Dourex (Dow Chemical Company), Sclear (Dupont Canada Company), Marlex (Philips Company), Excellen. VL (Sumitomo Chemical), Neo-Zex and Ultox (Mitsui Petrochemical), Nisseki Linirex (Nippon Petrochemical), NUC Polyethylene-LL, TUFTHENE (Nippon Unicar), Idemitsu Polyethylene-L, MORETEC (Idemitsu Petrochemical), Stamirex (DSM) and the like.

The aluminum vacuum vapor deposition molecular orientation film constituting the inner laminated film is a molecular orientation film processed with an aluminum vacuum vapor deposition layer.

As the molecular orientation film, a thermoplastic resin film having a thickness of 5 to 60 μm is used. Most preferred thickness is 8-40
It is a polypropylene film, a polyester film, a high-density polyethylene film, a polyamide film, a polystyrene film having a uniaxial or biaxial molecular orientation of μm, and a mixed resin film of any one of these resins and another resin.

An ultrathin reinforced film having a high blow ratio using a high-density polyethylene resin is particularly preferable because it has a large physical strength and is inexpensive. The uniaxial molecular orientation thermoplastic resin film is a film in which molecules are uniaxially oriented. A uniaxially stretched film is a typical uniaxially oriented film. It can also be molded using a device for forcibly orienting molecules in a uniaxial direction. According to the present invention, such a molecular orientation film has a difference in tear strength between the molecular orientation axis and the orthogonal axis of 2 or more.
It means all films that are more than doubled. Particularly, a uniaxially stretched film having a stretching ratio of 3 or more is preferable. Even a non-stretched film that is not stretched, a single-layer or multi-layer blown film using a special resin composition can be used as an inexpensive uniaxial molecular orientation film.

The molecular orientation direction may be horizontal, vertical or oblique.

In the present invention, the biaxially stretched film is a film stretched 1.5 times or more in both length and width, and may be stretched separately in length and width, or in both directions simultaneously. Is also good.

Further, the molecular orientation film may be laminated as a single layer alone, or may be laminated as a layer of the same kind or a coextrusion film layer with another layer.

The vacuum deposition method is used to process the aluminum vacuum deposition layer on the molecular orientation film.

The aluminum vacuum vapor deposition layer preferably has a thickness of 55 to 1200 Å from the viewpoint of physical strength as a laminate, light-shielding property, antistatic property and moisture-proof property, cost and quality. That is, if the thickness is less than 55Å, it is difficult to reduce the charge generated on both surfaces of the aluminum vacuum deposition layer, and the thickness of the layers laminated on both sides of the aluminum vacuum deposition layer must be increased to increase the thickness of the photographic material. It is difficult to secure the necessary moistureproofness and light-shielding properties as a double packaging bag.

Also, if the thickness exceeds 1200 Å, antistatic property, moisture resistance,
Although the light-shielding property can be secured, there is a problem in that the stretched film is deteriorated due to cost and heating during vacuum deposition, and the physical strength of the finished packaging bag is lowered.

When aluminum vacuum deposition is applied to the molecular orientation film,
In order to improve the adhesion with the aluminum vacuum deposition layer,
Anchor coating on molecularly oriented film
agen) may be applied.

Further, the surface of the molecular orientation film can be subjected to surface treatment such as glow discharge treatment, corona discharge treatment, ultraviolet irradiation, ozone treatment, chemical treatment, flame treatment and the like.

The aluminum vacuum-deposited biaxially stretched film constituting the outer laminated film may be the same as or different from that used for the molecularly oriented film of the inner laminated film. The stretching ratio of the biaxially stretched film of this aluminum vacuum vapor deposition biaxially stretched film is 1.5 times or more.

The thermoplastic resin film constituting the outer laminated film is
It may be the same as or different from the thermoplastic resin film forming the inner laminated film.

Further, the inner and outer surfaces of the inner laminated film and the inner surface of the outer laminated film have heat sealing properties. This heat sealing property is for facilitating bag making. Therefore, if the inner surface has a heat-sealing property to the extent that it can be made into a bag, various resin compositions can be used. Further, even if the inner surface is provided with a layer having heat sealability separately, in the inner laminated film, the light-absorbing light-shielding thermoplastic resin film is also used, and in the outer laminated film, the light-shielding thermoplastic resin is used. A resin film may also be used.

Furthermore, the outer surface of the outer laminated film has low dust generation. This low dusting property is to prevent dust from adhering to the photographic light-sensitive material when the photographic light-sensitive material is stored. Therefore, the outer surface may be made of, for example, a synthetic resin film, cellophane, or the like that generates less dust.
On this outer surface, a layer having a low dust generation property may be separately provided, or a light-shielding thermoplastic resin film may be used in common.

Examples of the light-shielding substance used for the light-shielding thermoplastic resin film of the outer laminated film include carbon black, graphite, metal powder, metal fibers, carbon fibers and the like.

Among these light-shielding substances, light-absorbing carbon black is preferable in terms of quality, cost, light-shielding ability and the like.

Carbon black is a light-absorbing light-shielding substance that can be kneaded or dispersed with a polyolefin resin, does not transmit visible light and ultraviolet rays, and imparts a light-shielding property to a polyolefin resin film. In addition, carbon black not only improves the tear strength, impact puncture strength, and heat sealability of the polyolefin resin film, but also prevents the formation of lumpy non-uniform faults (blocks) due to oxidation prevention of the resin, prevention of blocking, and lubricity. It is the most important substance that plays many roles such as improvement and adsorption of harmful substances (oxidizing / reducing substances, metals, etc.).

Depending on the raw material, carbon black is gas furnace black, oil furnace black, channel black,
It is classified into anthracene black, acetylene black, oil smoke, pine smoke, animal black, vegetable black and the like.

Among carbon blacks, pH 5-9, average particle size 10-200
Those of mμ are preferable, and furnace carbon black having a pH of 6 to 9 is particularly preferable. By using those having such a pH and particle size, the fog of the photographic light-sensitive material is small, the occurrence of increase or decrease in the photosensitivity is small, the light-shielding thermoplastic resin film has a large light-shielding ability, and the kneading dispersibility is high. Excellent, non-uniform blockage of carbon black
, Pinholes due to fish eyes, etc.
It is possible to obtain a light-shielding film having various advantages such as improvement in physical strength and heat sealability.

The metal powder has a light-reflecting and light-shielding physics to give an appearance of high commercial value, and is excellent in many points such as moisture-proof property, light-shielding property, antistatic property, heat resistance under sunlight, and gas barrier property.

As the metal powder, a material obtained by removing a low volatile substance from aluminum powder or aluminum paste and kneading with a thermoplastic resin has a silver appearance and is particularly preferably used on the outer surface of the outer laminated film.

As a method for blending these light-shielding substances into each layer, a master batch coloring method, a compound coloring method, a die color / granulation method or the like is used.

In order to form a laminated film by laminating the various films, for example, a thermal bonding method (hot plate bonding method, flame treatment bonding method, hot air heating bonding method, impulse bonding method, ultrasonic bonding method), an adhesive method ( Wet laminating method, dry laminating method, hot melt laminating method, extrusion laminating method, coextrusion laminating method), etc. are used.

As typical adhesives, various polyethylene resins,
Polypropylene resin, polyolefin-based thermoplastic resin hot-melt adhesive such as polybutene resin, ethylene-propylene copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene copolymer resin such as ethylene-ethyl acrylate copolymer resin, There are ethylene-acrylic acid copolymer resins, polyolefin resins with polar groups provided by graft copolymerization, thermoplastic resin hot melt adhesives such as anonomeric resins, and other hot melt type rubber adhesives. Further, as a solution adhesive, there is an adhesive for wet lamination, which is an emulsion or latex adhesive. Typical examples of emulsion adhesives are polyvinyl acetate resin, vinyl acetate-ethylene copolymer resin, vinyl acetate resin and acrylic ester copolymer resin, vinyl acetate resin and maleic ester copolymer resin, acrylic acid. There are emulsions such as copolymer resins and ethylene-acrylic acid copolymer resins. Typical examples of latex adhesives include natural rubber, styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), chloroprene rubber (CR)
And rubber latex. Further, as the adhesive for dry lamination, there is a polyurethane adhesive or the like. Other known adhesives such as paraffin wax, microcrystalline wax, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin blended hot melt laminate adhesive, pressure sensitive adhesive, heat sensitive adhesive, etc. It can also be used. The polyolefin resin adhesive for extrusion lamination, more specifically, various polyethylene resins, polypropylene resins, polyolefin resins such as polybutylene resin and ethylene copolymer (EVA, EEA, EMA, EAA, etc.) resin, L-L
Like DPE resin, in addition to ethylene, some other monomers (α
-Olefin), polar group-added polyolefin resin by graft copolymerization such as Surlyn of Dupont, Mitsui Toatsu Chemical Co., Ltd., ionomer resin (ion copolymer resin) such as Himilan of Mitsui Polychemical Co., Ltd. and ADMER, an adhesive polyolefin resin from Mitsui Petrochemical
Etc. are also included.

As the double packaging bag for the photographic light-sensitive material described above, any known double bag form such as double flat bag and double gusset bag can be used.

The method for forming a bag into a packaging bag is a conventionally known method for sealing a plastic film, such as heat sealing, fusing sealing, impulse sealing, ultrasonic sealing or high frequency sealing, depending on the properties of the laminated film used. Note that it is also possible to make a bag using an appropriate adhesive or pressure-sensitive adhesive.

INDUSTRIAL APPLICABILITY The double packaging bag for photographic light-sensitive material of the present invention is suitable for hermetically and light-shielding packaging of photographic light-sensitive material.

In particular, silver halide photographic light-sensitive materials, diazo photographic light-sensitive materials, photosensitive resins, self-developing photographic light-sensitive materials, diffusion transfer photographic light-sensitive materials, direct positive photographic light-sensitive materials whose quality is destroyed by slight gas, light and humidity. It is suitable for photographic light-sensitive materials such as materials and light-sensitive heat-sensitive materials, and particularly suitable for packaging relatively heavy weight of the above photographic light-sensitive materials.

[Action]

The double packaging bag for a photographic light-sensitive material of the present invention has a double structure in which an inner laminated film having an aluminum vacuum-deposited molecular orientation film arranged therein and an outer laminated film containing an aluminum vacuum-deposited biaxially stretched film are further arranged. Therefore, since it has physical strength and retains flexibility and does not damage the aluminum vacuum deposition layer, it is possible to secure moisture resistance, gas barrier property, light shielding property, and antistatic property.

Further, the inner laminated film and the outer laminated film have good heat-sealing suitability, and the outer laminated film produces less dust, improving the quality of the photographic light-sensitive material and further improving the appearance of the packaging bag.

〔Example〕

An embodiment of the double packaging bag for photographic light-sensitive material of the present invention will be described with reference to FIG.

FIG. 1 is a cross-sectional view of a state in which a photographic light-sensitive material is packaged in a double wrapping bag for photographic light-sensitive material. In this figure, reference numeral 13
Is an inner laminated film, reference numeral 14 is an outer laminated film, and these inner laminated film 13 and outer laminated film 14
In addition to being integrally heat-sealed at the end heat-sealing portions 17 ... 17, they are in a state of simply overlapping without being bonded.

Reference numeral 19 indicates a sealed photographic photosensitive material that is packaged.

The second layered structure of the double packaging bag for photographic light-sensitive material as described above
It will be described with reference to FIGS.

2 to 3 are partial cross-sectional views showing the layer structure of a double packaging bag for a photographic light-sensitive material.

In the double packaging bag for photographic light-sensitive material of FIG. 2, the inner laminated film 13 has a molecular orientation with two adhesive layers 3 and 3 between the two light-absorbing light-shielding thermoplastic resin films 2a. An aluminum vacuum vapor deposition molecular orientation film 10 obtained by vacuum vapor deposition of an aluminum vacuum vapor deposition layer 5 on a film 1 is laminated with the aluminum vacuum vapor deposition layer 5 inside. And
The two light-absorbing light-shielding thermoplastic resin films 2a have a heat-sealing property.

The outer laminated film 14 includes the light-shielding thermoplastic resin films 6a and 6a having a light-shielding substance added to both sides of the aluminum vacuum-deposited biaxially stretched film 22 including the biaxially stretched film 21 and the aluminum vacuum deposition layer 5. It is laminated via the adhesive layers 3 and 3. The two light-shielding thermoplastic resin films 6a have heat sealability and low dust generation.

In the double packaging bag for photographic light-sensitive material of FIG. 3, the inner laminated film 13 has a light-absorbing property on both sides of the aluminum vacuum-deposited molecular orientation film 10 provided so that the aluminum vacuum-deposited layer 5 is located inside. Light-shielding thermoplastic resin film
Two sheets of coextruded light-shielding thermoplastic resin film 7a composed of 2a and 2a are laminated via adhesive layers 3 and 3. Then, the light-absorbing light-shielding thermoplastic resin film 2a
Has heat sealability.

The outer laminated film 14 is an aluminum vacuum deposition layer 2 provided so that the aluminum vacuum deposition layer 5 is located outside.
A coextruded thermoplastic resin film 8a made of a light-shielding thermoplastic resin film 6a containing a light-shielding substance is laminated on both surfaces of the axially stretched film 22 with an adhesive layer 3 interposed therebetween. The light-shielding thermoplastic resin film 6a has heat sealability and low dust generation.

4 and 5 are partial cross-sectional views showing the layer structure of the comparative product.

The comparative product shown in FIG. 4 is a co-extrusion light-shielding thermoplastic resin film 7a having an aluminum vacuum deposition molecular orientation film layer on the outer surface.
10 is laminated with the aluminum vacuum deposition layer 5 inside with the adhesive layer 3 in between.

In the comparative product shown in FIG. 5, the aluminum vacuum-deposited molecular orientation film 10 and the aluminum vacuum-deposited layer 5 are provided on the outer surface of the light-shielding thermoplastic resin extrusion laminate film 2a.
With the inside as the inner side, without being directly connected by an adhesive layer.

Next, the experimental results comparing the characteristics of the product I of the present invention, the comparative products I and II, and the conventional product I will be described.

Product I of the Invention The product I of the present invention corresponds to the layer structure shown in FIG.

In the inner laminated film 13, the aluminum vacuum deposition molecular orientation film 10 has a thickness of 15 μm as a molecular orientation film.
A biaxially stretched nylon film of m is used, and the aluminum vacuum deposition layer 5 is processed to have a thickness of 400Å.

Further, the coextrusion light-shielding thermoplastic resin film 7a is used as the light-absorbing light-shielding thermoplastic resin film 2a located on the inner side, LDPE resin 5% by weight, furnace carbon black 3% by weight, ethylene 4-methylpentene- 1 Copolymer resin {Ultzex 2020L, melt index (hereinafter referred to as MI) 2.1 g / 10 minutes, density 0.924 g / cm ³ , Mitsui Petrochemical Co., Ltd.} 92 wt% 40 μm thick light-shielding property L-
An LDPE resin film is used as the light-absorbing light-shielding thermoplastic resin film 2a located outside, and 3% by weight of furnace carbon black, HDPE weight (Hi-Zex 3300F, M
I1.1g / 10 minutes, density 0.954g / cm ³ , Mitsui Petrochemical Co., Ltd.)
A 40 μm thick light-shielding HDPE resin film consisting of 97% by weight was used.

As the adhesive layer 3, an LDPE resin extrusion laminate adhesive layer having a thickness of 13 μm was used.

Aluminum vacuum deposition 2 on the outer laminated film 14
Axial stretched film 22 and coextruded thermoplastic resin film 8a
Is an aluminum vacuum-deposited molecular orientation film 10 of the inner laminated film 13 and a coextrusion light-shielding thermoplastic resin film.
Same as 7a. And it is formed in the double bag as shown in FIG.

Comparative product I Comparative product I corresponds to the layer structure of FIG.

The coextrusion light-shielding thermoplastic resin film 7a is the product I of the present invention.
Is the same as Aluminum vacuum deposition molecular orientation film
For No. 10, a biaxially stretched polyester resin film having a thickness of 12 μm was used as the molecular orientation film 1, and the aluminum vacuum deposition layer 5 had a thickness of 400 Å. The adhesive layer 3 is the same as the product 1 of the present invention.

The laminated film is formed into a single bag.

Comparative product II Comparative product II corresponds to the layer structure of FIG.

The light-shielding thermoplastic resin film 2a is made of carbon black 3
% By weight, ethylene-4-methylpentene-1 copolymer resin (Ultox 2080L, MI 7g / 10min, density 0.920g / c
m ^3, manufactured by Mitsui Petrochemical Co.) thickness 80μ consisting 97 wt%
m light-shielding L-LDPE resin extrusion laminating film was used. The aluminum vacuum deposited molecular orientation film 10 is the same as the comparative product 1.

The laminated film described above is formed into a single bag.

Conventional product I Conventional product I corresponds to the layer structure shown in FIG.

As the thermoplastic resin foam sheet 11, a crosslinked LDPE resin foam sheet having a thickness of 1 mm and an expansion ratio of 30 was used. Molecular orientation film
6a has a thickness of 45μ containing 4.5% by weight of carbon black.
m light-shielding uniaxial molecular orientation HDPE resin film was used. The adhesive layer 3 is the same as the product I of the present invention.

The laminated film is formed into a single bag.

The results are shown in Table 1.

The evaluation is as follows.

◎… very good ○… excellent ●… possible (within practical limits) ▲… problem (needs improvement) ×… not practical * A curling A circular test sample with a diameter of 10 cm is made with the packaging material to be tested. Then, after leaving it for 24 hours under a load plate of 1 kg in an atmosphere of a temperature of 20 ° C. and a humidity of 65% RH, each circular test sample was allowed to stand on a flat plate for 24 hours without load in the atmosphere of the above conditions. Evaluated in the curling state afterwards * B Bag making suitability Comprehensively evaluated the strength, appearance, pinhole prevention, front / back distinction, antistatic property, delamination strength, etc. of the sealing part when making a sealed bag by heat sealing * C peeling electrification voltage An endless belt with a width of 35 mm and a length of 1350 mm was made from the packaging material to be tested, and a peeling belt was applied when this belt was sent between a SUS roller (stainless steel) with a load of 500 g and a SUS roller at a speed of 12 m / min. Voltmeter (new Kagaku KK)
The value measured in.

* D Heat resistance Measured by a thermistor to measure the surface temperature rise of the packaging material after leaving it in the sunlight (80,000 lux) for 3 hours.

* E Heat seal suitability Hot tack, foreign matter sealability, heat seal strength,
Judged from total heat sealing suitability such as heat seal strength retention property over time, allowable temperature range for heat sealing, etc. * F heat retention In a sealed bag made using each packaging material after left in sunlight (80,000 lux) for 3 hours Judgment by measuring the temperature rise of the above with a thermistor [Effect of the invention] As described above, since the double packaging bag for photographic light-sensitive material of the present invention is excellent in light-shielding property and physical strength, no bag breakage occurs,
It completely maintains the light-shielding property, moisture-proof property, and gas barrier property, and secures the dimensional stability of the photosensitive seal film.

In addition, since there is no curling and the heat sealing suitability is good, the suitability for bag making is good, and the outer surface is low in dust generation and smooth, so that a double packaging bag with excellent appearance and high commercial value is formed. .

In addition, because it is a packaging bag that has excellent light-shielding properties, good heat retention and antistatic properties, low dust generation, and an appearance that does not cause bag breakage, it is possible to use a light-shielding cardboard box that is expensive for exterior packaging. Quality can be secured without using it.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment in which a photographic light-sensitive material is packaged in a double packaging bag for a photographic light-sensitive material of the present invention, and FIGS. 2 to 3 show a layer structure of the embodiment of the double-wrapping bag of the present invention. It is a fragmentary sectional view shown. 4 and 5 are partial cross-sectional views showing the layer structure of the comparative product packaging bag. 6 and 7 are partial cross-sectional views showing the layer structure of a conventional packaging bag. DESCRIPTION OF SYMBOLS 1 ... Molecular orientation film 2a ... Light-absorbing light-shielding thermoplastic resin film 3 ... Adhesive layer 5 ... Aluminum vacuum deposition layer 6a ... Light-shielding thermoplastic resin film 10 ... Aluminum vacuum deposition molecular orientation film 13 ... Inner laminated film 14 Outer laminated film 17 Heat-sealed portion 19 Photographic material 21 Biaxially stretched film 22 Aluminum vacuum-deposited biaxially stretched film a; Indicates that a light-shielding substance is added.

Claims (2)

[Scope of utility model registration request] 1. An inner laminated film and an outer laminated film, wherein the inner laminated film has an aluminum vacuum vapor deposition molecular orientation film having a thickness of 5 to 60 μm, and pH 5 to 9 and average particles laminated on both surfaces thereof. The outer laminated film is made of a light-absorbing light-shielding thermoplastic resin film containing furnace carbon black having a diameter of 10 to 200 mμ, and the outer laminated film has a thickness of 5 to 60 μm.
Of the aluminum vacuum-deposited biaxially stretched film, and a light-shielding thermoplastic resin film laminated on both surfaces thereof, the inner and outer surfaces of the inner laminated film and the inner surface of the outer laminated film each have a heat-sealing property, and the outer surface The outer surface of the laminated film has low dust emission, and the stretching ratio of the biaxially stretched film of the aluminum vacuum vapor deposition biaxially stretched film is 1.
Double packaging bag for photographic light-sensitive materials, which is more than 5 times 2. A utility model registration claim in which the light-shielding thermoplastic resin film of the outer laminated film is light-absorbing.
Double packaging bag for photographic light-sensitive material