JP2001051379A - Sheet film package and sheet film pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost sheet film package where waste is generated little and a sheet film pack where the loading operation of a unit using the package is easily and rapidly performed in a bright room. SOLUTION: One belt-like sheet member 2a constituting a light shielding bag 2 consists of a packaging part 8 and a tongue piece part 9 whose one end is extended in a longitudinal direction. As for this sheet film package 1, a sheet film unit 3 is housed in the packaging part 8 folded in two, and the base part of the tongue piece part is sealed by a sealing part in the vicinity of the end of the packaging part and both aperture parts of the packaging part are slightly sealed. The sheet film pack is provided with a guide roller reducing drawing-out resistance and a pair of projected line parts regulating the movement of the unit 3 to the guide roller side. By pulling the tongue piece part projected outward after the sheet film package is inserted in the film housing chamber of the sheet film pack and a slide is closed, the sealing part and the sealing parts at both edges of the packaging part are successively peeled, and the light shielding bag breaks down and is restored to an original sheet member, then it is drawn out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet film package and a sheet film pack, and more particularly to a sheet film package in which a sheet film unit is packaged with one sheet member and a sheet film pack to be loaded with the sheet film unit. It is.

[0002]

2. Description of the Related Art A large-sized camera using a sheet film having a size of 4 × 5 inches or more is capable of continuously photographing about 5 to 10 sheets without changing a photographing frame, and a film pack holder. There is known a sheet film pack to be loaded on a vehicle. For example, JP-A-4-3506
The sheet film pack described in Japanese Patent Publication No. 34-134 has a box-shaped pack main body in which a plurality of sheet film units each containing unexposed sheet films stored in a sheath one by one are stored in advance, and formed on the front surface thereof. It comprises a lid for opening and closing the opening, and a leaf spring provided in the pack body and for urging the stacked sheet film units toward the opening.

First, a film pack holder is attached to an exposure frame of a camera, and then a sheet film pack is loaded into a middle frame of the film pack holder. Next, once the lid is pulled out, the first sheet film unit is pushed up from the opened opening by the pressure plate spring and set in the exposure opening of the film pack holder. Thereafter, when the lid is inserted again, the lid enters between the first and second sheet film units. At this time, the lid is locked to the pack body by the lock mechanism, and the pull-out of only the lid is prohibited. In this state, the first photographing is performed.

After the first image has been photographed, when the user grips the handle of the lid and pulls it, the sheet film pack together with the middle frame is pulled out of the film pack holder. When the sheet film unit is pulled out by a predetermined amount, the exposed sheet film unit comes out of the pack main body and is pushed into the bottom of the film pack holder by a leaf spring incorporated in the film pack holder. Next, when the sheet film pack together with the middle frame is pushed into the film pack holder, the exposed sheet film unit enters into the sheet film pack from the bottom side of the sheet film pack, and becomes the lowermost layer of the stacked sheet film units. Collected.

[0005] By pushing and pulling the handle of the lid in this way, the photographing can be performed sequentially from the uppermost sheet film unit, and the exposed sheet film unit is automatically collected in the sheet film pack. Is done. Therefore, by preparing a plurality of sheet film packs, it is possible to shoot a large number of sheets almost continuously.

[0006]

After the above-mentioned sheet film pack is used, the exposed sheet film unit is taken out and discarded. Since the pack body and lid of the sheet film pack are made of resin, and the leaf spring is made of metal, it is difficult to reduce the cost, and when performing a large amount of shooting, it is necessary to purchase a large number of sheet film packs. Yes, uneconomical. Discarding the pack body, the lid and the leaf spring (hereinafter referred to as the pack body and the like) poses a problem in terms of resource protection and environmental protection. Although it is not impossible to reuse the pack body or the like, an extremely troublesome work of storing a new sheet film unit in a sheet film pack in a dark room or dark back is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a low-cost sheet film package with a small amount of waste, and a sheet film unit loading operation using the same can be performed easily and quickly in a light room. It is an object of the present invention to provide a sheet film pack that can be used.

[0008]

In order to achieve the above object, a sheet film package according to the present invention comprises a sheet film unit in which rectangular sheet films are housed one by one in a sheath, and a plurality of laminated sheet films. A strip-shaped sheet having a longitudinal length comprising a wrapping portion for wrapping the sheet film unit in two and a tongue piece provided by extending the one end portion in the longitudinal direction, the length being longer than three times the length of the sheet film unit. With the sheet film unit laminated while the packaging part is folded in two, the end of the packaging part is sealed at the base of the tongue piece, and both sides of the cylindrical packaging part Each of the openings is light-tightly closed by sealing this edge, and the end of the tongue is pulled in a predetermined direction to thereby obtain the base of the tongue and the end of the packaging part. Sea with And wherein is obtained as a seal of each opening is decomposed into its original seat member peeled off sequentially. Further, the seal between the base of the tongue piece and the end of the packaging part has a mountain shape with the top facing the end of the tongue piece. The sheath has four rounded corners.

[0009] The sheet film pack of the present invention comprises:
A sheet film unit in which a rectangular sheet film is housed one by one in a sheath, a wrapping portion for wrapping a plurality of laminated sheet film units in two, and a tongue provided by extending one end of the sheet film unit in the longitudinal direction A sheet film pack for loading a sheet film package composed of a long band-shaped sheet member comprising a sheet part and a box-shaped film storage chamber in which the packaging part of the sheet film package is stored And a guide roller provided adjacent to the film storage chamber of the pack body and provided orthogonal to the longitudinal direction of the tongue piece extending from the packaging portion. The sheet film unit is provided with a pair of ridges protruding from the back side of the film storage chamber and long in the thickness direction of the sheet film unit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of a sheet film package of the present invention.
It comprises a light-shielding bag 2 and a plurality of, for example, 10 sheet film units 3 stacked and stored therein. This sheet film unit 3 has a 4 ×
It comprises a 5-inch sheet film 5 and a resin sheath 6 for accommodating the same. This sheath 6
The four corners are rounded so that the sheet member 2a constituting the light shielding bag 2 is not caught.
In addition, although the radius R is set to be 0.5 mm or more in radius,
If the thickness is more than mm, the thickness of the sheath will be exceeded and the sheet film 5 will be exposed.

As shown in FIG. 3, the light-shielding bag 2 has a length D1 (about 555 mm) in the longitudinal direction which is about 4.3 times the length D2 (about 129 mm) of the sheet / sheet film unit 3.
It is formed of a sheet-like sheet member 2a. The sheet member 2a includes a substantially rectangular wrapping portion 8 that wraps ten laminated sheet film units 3 in two, and a tongue piece portion 9 that is provided with one end portion extending in the longitudinal direction. ing. As the material of the sheet member 2a, for example, polyethylene (PE) mixed with carbon black can be used. In the present embodiment, a polyethylene sheet having a thickness of 20 μm and a thickness of 12 μm
Was used, a urethane-based weak seal adhesive was applied on one side, and a matting agent (eg, silica) was dispersed in acetylcellulose and applied on the other side.

The packaging portion 8 has a rectangular shape, and the corners on the side of the end 8a are chamfered at an angle θ1. The angle θ1 is in the range of 20 ° to 70 °. If the angle θ1 is smaller than 20 °, a seal described later will not be peeled off. If the angle θ1 is larger than 70 °, light leakage will be feared and the seal may be torn when peeling off.

The width D3 of the packaging portion 8 is about 150, which is slightly larger than the width D5 (about 103 mm) of the sheet film unit 3.
mm, and the length D4 is about 300 mm, which is slightly longer than twice the length D2 of the sheet film unit 3. The tongue piece 9 includes a base 9a extending one end of the packaging portion 8 and a narrow tip 9b having a tip narrowed by an arc-shaped edge of αR.

Adhesives for weak sealing are linearly applied to the edges 8b and 8c on both sides of the packaging portion 8 from the corners to the corners P and Q of the base 9a of the tongue piece 9 as shown by hatching. Thinly applied. In the width D3 direction between the angles P and Q, the angles P and Q
With the top 13c as the tip 9
A mountain-shaped seal portion 13 facing the b side is provided.
The adhesive applied to the edges 8b, 8c and the seal portion 13 does not adhere to other objects or adsorb dust in normal handling, and exerts an adhesive force only when heated and pressed. Things.

In order to wrap the sheet film unit 3 with the sheet member 2a, first, the sheet member 2a is folded in two at a folding line 15 at a position half the length D4 of the packaging portion 8, and ten sheet films laminated between the two. Unit 3 is inserted. Next, the tongue piece 9 is superimposed on the packaging part 8 so as to surround the sheet film unit 3, and the mountain-shaped seal part 13 is heated and pressed from above the tongue piece 9. As a result, the base 9a of the tongue piece 9 is adhered to the surface near the end 8a of the packaging portion 8, and the sheet member 2a becomes cylindrical as shown in FIG. The unit 3 is wrapped.

Thereafter, the edges 8b and 8c of the openings 16 and 17 formed on both sides of the wrapping portion 8 near the four corners of the sheet film unit 3 are opened as shown in FIG. (A), the opposing edges 8b and 8c are brought into close contact with each other, heated and pressed from the outside, and lightly sealed weakly (B). Thereafter, the tongue piece 9 is folded back from the vicinity of the top 13c of the seal portion 13 so as to wrap around the end 8a of the packaging portion 8, thereby completing the sheet film package 1 as shown in FIG. The edges 8b and 8c may be further laid down on the side surface 8d of the packaging portion 8 to weakly seal.
In this way, the protrusions are eliminated from the periphery of the packaging portion 8, so that the sheet film pack can be more easily loaded.

The sheet film package 1 is used by being inserted into a film storage chamber 21 of a sheet film pack 20, as shown in FIGS. The sheet film pack 20 includes a box-shaped pack main body 23 in which a film storage chamber 21 is formed, and a handle 2 for opening and closing an opening 23a formed in an upper portion of the pack main body 23 (a side to be attached to a camera).
5a with a lid 5a. In addition, pack body 2
A detachable cap member 26 is provided at the end of the third member 3. A leaf spring 27 for urging the loaded sheet film unit 3 toward the opening 23a is provided on the bottom surface of the film storage chamber 21.

A guide roller 28 for guiding the tongue piece 9 is attached to an end of the film storage chamber 21 on the handle 25a side. The guide roller 28 is attached so that its longitudinal direction is perpendicular to the longitudinal direction of the film storage chamber 21 so as to be perpendicular to the pulling direction of the tongue piece 9. The length of the guide roller 28 is longer than the width of the tongue piece 9 and shorter than the width of the short side of the film storage chamber 21. The diameter of the guide roller 28 is, for example, 2 m.
m.

Both ends of the guide roller 28 and the pack body 23
A pair of bearing portions 29 of the guide roller 28 are formed integrally with the pack body 23 between the inner surface of the side wall of the sheet film unit 3 and the surface of the bearing portion 29 on the film storage chamber 21 side in the thickness direction of the sheet film unit 3. A long ridge 30 is provided in a pair. The pair of ridges 30 is
It protrudes further into the film storage chamber 21 and regulates the movement of the sheet film unit 3 toward the guide roller 28. Thus, when the tongue piece 9 is pulled out, the sheet film unit 3 is prevented from being dragged by the sheet member 2a and moving to the handle 25a side, and biting into the guide roller 28.

On the opposite side of the film storage chamber 21 with the guide roller 28 interposed therebetween, there is a gap passage 33 for passing the tongue piece 9 between the film storage chamber 21 and the lid 25. An elongate light shielding member 34 is attached in the short side direction. Outside the light blocking member 34 of the gap passage 33, a pair of gentle arc-shaped guide projections 35 are formed on both sides to regulate the width direction of the sheet member 2a. Although not shown, a counter storage chamber for storing a counter display plate for displaying the number of shots is provided below the gap passage 33.

In order to load the sheet film unit 3 into the sheet film pack 20 constructed as described above, the packaging portion 8 of the sheet film package 1 is turned with the base 9a of the tongue piece 9 facing the cap member 26. It is inserted into the film storage room 21. As a result, the tip 9b is projected outside the pack body 23 with the tongue piece 9 riding on the guide roller 28 and the gap passage 33.

Next, the lid 25 is passed through guide grooves 23b and 23c provided on both sides of the opening 23a.
Close. As a result, although not shown, the claw incorporated in the cap member 26 engages with the hole formed at the tip of the lid 25, and the lid 25 is locked.

Thereafter, when the tip 9b of the tongue piece 9 is gripped and pulled away from the pack body 23, the pulling force is first concentrated on the top 13c of the seal 13, so that the seal 13 is It begins to peel off easily with a slight pulling force. This peeling gradually starts from the top 13c,
After propagating toward 3a and 13b and reaching the corners P and Q, the sealing portions of the edges 8b and 8c start to peel off.

During this time, the pulling force is applied to the guide roller 28.
Is transmitted to each seal portion with little loss. In addition, the packaging portion 8 can be moved by the pulling force.
Is pulled toward the guide roller 28, but the movement of the packaging portion 8 is restricted by the pair of ridges 30, so that the tongue piece 9 being pulled out is sandwiched between the packaging portion 8 and the guide roller 28. Load is prevented. This allows
The tongue piece 9 can be pulled with a light force. The corners of the sheet film unit 3 and the inner surface of the sheet member 2a rub against each other. However, since the four corners of the sheet film unit 3 are rounded, there is no possibility that the sheet member 2a is torn by the corners of the sheet film unit 3.

As the peeling of the sealing portions of the edges 8b and 8c progresses, the width of the sealing member 2a passing through the gap passage 33 increases.
5 passes through substantially the center of the gap passage 33 without being largely biased. The sheet film unit 3 is exposed as the seals of the edges 8b and 8c are peeled off. However, since the movement of the sheet film unit 3 is also restricted by the ridges 30, the sheet film unit 3 is
And there is no possibility of being drawn between the lid 25 and the guide roller 28 due to contact with the guide roller 28.

When the sealing portions of the edges 8b and 8c are completely peeled off, the light-shielding bag 2 returns to the original one sheet member 2a and is drawn out of the pack body 23 through the gap passage 33. As a result, the ten sheet film units 3 remain in the film storage chamber 21 in a stacked state, and the film loading is completed.

When the photographing of all the sheet film units 3 is completed, and a new sheet film package 1 is loaded into the sheet film pack 20 from which the photographed sheet film units 3 have been taken out, the pack body 23 of the sheet film pack 20, The lid 25 and the like can be used many times and are economical. Further, since the waste is only one sheet member 2a, there is no problem in resource protection and environmental protection. Further, in terms of the weight of the waste, about 70 g: about 3.
Reduced to 5g. The sheet film package 1 is
Since the volume is about half that of the sheet film pack 20, the transportation efficiency in the distribution process is significantly improved.

The sheet member used in the present invention is required to have high light-shielding properties, high slipperiness, and moderate rigidity.
The light passing from the sheet surface of the sheet member to secure the light shielding property of the sheet film unit is at least 0.0
It should be less than 1 lux / sec.
To guarantee light shielding of 100,000 looks and 100 seconds, 1 /
It is necessary to reduce the light to 10 ⁹ or less. For this reason, it is preferable that carbon black, aluminum foil, aluminum vapor deposition, or a combination thereof is applied to the sheet member. The addition amount of carbon black is set so as to be 1 g / m ² or more, preferably 1.5 g / m ² or more. The carbon black used is preferably a low sulfur component, for example, a material described in JP-A-3-179342.

The polymer used for the sheet member is polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyamide (PA),
Polycarbonate (PC), polystyrene (PS), polyphenylene oxide (PPO) and the like are listed, and they are complex in terms of rigidity, adhesive adhesion, carbon black dispersibility, ease of lamination, ease of vapor deposition layer, etc. used.

A point to be noted in the light-shielding property is a pinhole-shaped light leakage phenomenon. This is because light fog occurs when unevenness in the thickness of the light-shielding layer or the vapor deposition layer and repelling phenomenon occur. Also, when the sheet film unit is wrapped in a bag with a sheet member, if there is poor bonding on the sealing surface, light may enter from the sealing surface.Therefore, pay attention to sealing conditions and coating uniformity of the bonding surface. There must be.

As for the sheet member, the draw-out force decreases as the smoothness between the unsealed surfaces and the smoothness between the sealed surface and the pressure plate of the camera increases. In particular, since the surface of the wrapping portion, which is the surface of the unsealed side of the sheet member, and the one surface of the tongue piece have the largest rubbing area, if the friction coefficient between them is large, the pulling resistance of the tongue piece is large. As a result, the sheet member cannot be smoothly pulled out from the pack body.

In order to reduce the friction coefficient,
Lubricity was imparted to the sheet member. This includes a method of adding to the outermost layer of the sheet member and a method of coating. Lubricants include silicone oils, higher fatty acid amides such as oleic acid amide, metal salts of higher fatty acids such as zinc stearate, higher alcohol esters, fatty acid esters of polyhydric alcohol esters, and acrylic fine particle mats. And a method of applying a silica-based matting agent to the surface layer.

Also, the smaller the rigidity of the sheet member, the lower the resistance to pull out, but the more easily the sheet member is torn.
If the torn material partially remains in the camera, it will be reflected during photographing, causing a problem. Further, if the rigidity is large, the resistance becomes excessive when the wire is pulled out. As a material with low rigidity, P
E, PA, PET, PC, PS as rigid materials
The optimal rigidity can be ensured by combining them and adjusting the thickness.

The provision of moisture proofing is effective in protecting the film. The surface transmittance of water is 40 ° C. 9
It is preferable that the material be 5 mg / 24 hr · 1 m ² or less in an atmosphere of 0%. However, if the moisture-proof property of the weakly sealed portion cannot be ensured, the use of an external packaging material further increases the moisture-proof property. Can be secured. In this case, it is not necessary to ensure the moisture resistance of the sheet member. Aluminum foil, aluminum evaporation, ceramic evaporation and the like can be used to ensure moisture proofness.

After wrapping the sheet film unit,
Since the film surface and the sheet member are rubbed and pulled out,
The lower the air resistance of the film surface, the less the occurrence of static fog. There is a method of kneading or coating an antistatic agent or carbon black on at least the outermost layer on the side (inner side) of the sheet member that wraps the sheet film unit.

The above-mentioned weak seal means that two sheet members are
After bonding with an area of 0 mm × 5 mm, one sheet member is fixed and the other sheet member is pulled in the horizontal direction and in the longitudinal direction of the bonding area, and the two sheet members are 5 mm apart from each other.
The adhesive has a maximum tensile strength of 700 g or less, preferably 100 g or more and 500 g or less when peeled.

As the adhesive, a thermoplastic adhesive is used. For example, as a vinyl-based resin, polyvinyl acetate, polyacrylate, as a polycondensation-based resin, polyamide, polyester, and as a polyaddition-based resin, thermoplastic polyurethane, polyvinyl alcohol, and the like can be given.
These may be used in combination.

In order to impart a weak sealing property, the coating amount of the adhesive is reduced, and the molecular weight and other resins (for example, filler, plasticizer,
It is effective to reduce the cohesion by adding a thickener. Alternatively, the sealing surface of the sheet member may be treated with a material that is difficult to adhere (for example, silicone, a fluorine-based material, or the like) to reduce the adhesive strength at the interface.

In the embodiment described above, the seal 13
After the sheet member 2a is formed into a tubular shape by weak sealing, the four corners of the wrapping portion 8 are folded into an M-shape to weakly seal, but as shown in FIG. After the inner surfaces are joined together, the sealing portions are brought into close contact with each other and heated and pressed to weakly seal (A). Then, the weakly sealed edge 8b is laid down on the side surface 8d of the packaging portion 8 to weakly seal, Further, the triangular tip 8e may be bent and fall down on a surface 8f perpendicular to the side surface 8d to weakly seal. In this case, it is preferable to previously provide a triangular seal portion 40 corresponding to the shape of the distal end 8e at a predetermined position on the surface 8f where the distal end 8e is weakly sealed. This seal part 4
Reference numeral 0 indicates that the adhesive for weak sealing is applied in a triangular shape. The edge 8c opposite to the edge 8b is also sealed in the same manner as the edge 8b.

In the above-described embodiment, the inclination of the ridge of the seal portion 13 is equal to the left and right. However, one skirt end of the hill-shaped seal portion is shifted toward the tip of the tongue piece from the other skirt end. You may. Thereby, since the seal part is peeled in the order of the top part → one skirt end → the other skirt end, the load applied when pulling the tongue piece part is reduced, and the seal part can be peeled with a lighter force than in the embodiment. become able to.

In addition, the above-mentioned mountain-shaped seal portion may be provided in a double manner in order to further ensure light-shielding properties. Further, in the above embodiment, the adhesive is applied only to the seal portion. However, the adhesive is applied to the entire surface of one side of the sheet member in advance, and only the portion serving as the seal portion is heated and pressed. It may be.

In the above embodiment, the tip of the tongue piece has a linear shape. However, the present invention is not limited to this. For example, the tip may have a semicircular shape.

[0043]

As described above, according to the sheet film package of the present invention, a plurality of sheet film units laminated by one band-shaped sheet member are wrapped in a bag shape, and the tongue piece is oriented in a predetermined direction. Since the sheet member is disassembled by pulling it, it can be manufactured at extremely low cost, and can be loaded into a sheet film pack in a light room. It is also advantageous in terms of protection and environmental protection. Also, the seal between the base of the tongue piece and the end of the packaging part,
Since the top is formed in a mountain shape facing the end of the tongue, the pulling force on the tongue is concentrated first and applied to the top of the seal, and it starts to peel off easily from this part. Can disassemble the sheet member. Further, since the corners of the sheath are rounded, there is no possibility that the sheet member will be torn even if the corner of the sheath and the sheet member rub against each other when the tongue piece is pulled, so that the sheet member can be disassembled reliably.

Further, according to the sheet film pack of the present invention, since the guide roller is provided near the film storage chamber, the pull-out resistance when pulling the tongue piece of the sheet film package is reduced, and the sheet member is lightly pressed. Can be pulled out. In addition, a pair of ridges protruding from the guide rollers to the back side of the film storage chamber outside both ends of the guide rollers and being long in the thickness direction of the sheet film unit are provided. By regulating, there is no possibility that the sheet film unit is pulled in between the guide roller and the lid. In addition, since the above-mentioned sheet film package is used, the sheet film unit can be loaded in a bright room by simply pulling out the tongue, so that anyone can load the sheet film unit extremely easily and quickly. Further, the pack body and the like can be used many times, which is economical and advantageous in terms of resource protection and environmental protection.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a sheet film package.

FIG. 2 is a perspective view illustrating an appearance of a sheet film unit.

FIG. 3 is a development view of a light shielding bag.

FIG. 4 is a perspective view of a sheet film package showing a cylindrical package unit.

FIG. 5 is an explanatory diagram showing a state in which edges of openings near four corners of the sheet film unit are folded into an M shape.

FIG. 6 is a perspective view of the sheet film pack showing a state in which the lid is pulled out and the sheet film package is inserted into the film storage chamber.

FIG. 7 is a plan view of the sheet film pack shown from the opening side of the pack body.

FIG. 8 is a schematic sectional view of a sheet film package and a sheet film pack.

FIG. 9 is an explanatory diagram showing another sealing method of the edge of the opening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet film package 2 Light shielding bag 2a Sheet member 3 Sheet film unit 8 Packaging part 8b, 8c Edge 9 Tongue piece part 13 Seal part 20 Sheet film pack 21 Film storage room 23 Pack body 25 Guide lid 30 Guide roller 30 Ridge Part 35 Guide protrusion

Claims (4)

[Claims] 1. A sheet film unit in which a rectangular sheet film is housed in a sheath one by one, a wrapping part for wrapping a plurality of laminated sheet film units in two, and one end thereof is extended in the longitudinal direction. A strip-shaped sheet member having a length in the longitudinal direction comprising the provided tongue piece is longer than three times the length of the sheet film unit;
With the laminated sheet film unit inserted while the packaging part is folded in half, the end of the packaging part is sealed at the base of the tongue piece part, and each opening on both sides of the cylindrical packaging part is removed. This edge is sealed light-tight by sealing, and by pulling the end of the tongue piece in a predetermined direction, the seal between the base of the tongue piece and the end of the packaging part and the A sheet film package wherein seals at respective openings are sequentially peeled and disassembled into original sheet members. 2. The seal between the base of the tongue piece and the end of the packaging part has a mountain-like shape with a top directed toward the end of the tongue piece. Sheet film packaging. 3. The sheet film package according to claim 1, wherein the sheath has four rounded corners. 4. A sheet film unit in which a rectangular sheet film is housed in a sheath one by one, a packaging part for wrapping a plurality of laminated sheet film units in two, and one end of which is extended in the longitudinal direction. In a sheet film pack for loading a sheet film package composed of a long strip-shaped sheet member comprising a provided tongue piece, a box-shaped film storage chamber in which a packaging section of the sheet film package is stored is provided. A formed pack body, a guide roller provided adjacent to the film storage chamber of the pack body, and provided orthogonal to the longitudinal direction of the tongue piece extending from the packaging section; And a pair of protruding ridges which are provided so as to protrude from the guide roller to the back side of the film storage chamber and are long in the thickness direction of the sheet film unit. Sheet film pack, wherein the door.