JPS6348546A - Packing material for photosensitive sheet film - Google Patents

Abstract

PURPOSE:To obtain the titled material capable of maintaining physical strength and moisture proofing property by using a flexible covering member comprising a heat sealing layer which has a prescribed thickness and contains a polyolefin copolymer resin and a flexible sheet layer which is laminated on an outside of the heat sealing layer, and also having shading property. CONSTITUTION:The heat sealing layer 11 and the flexible sheet layer 12a are laminated through an adhesive layer 13. The flexible covering member comprises the heat sealing layer composed of the polyolefin copolymer resin and having thickness of 13-17mum, and the flexible sheet layer which is laminated on the outside of the heat sealing layer and has the shading property. The heat sealing layer of the flexible covering material is composed of the polyolefin copolymer resin. The polyolefin copolymer resin is made of various kinds of the polyolefin copolymer resin having good heat-sealing property according to a resin which forms a shading tray platform. Thus, the titled material which can stick to the film with a sufficient adhesive strength and has a large physical strength such as tensile strength and shearing stress, etc. and does not appear a hole and a tear in a physical distribution system is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention enables a photosensitive sheet film sensitive to radiation, such as an X-ray photographic film, to be loaded into an image recording device such as an image output laser printer device in a bright room. This relates to packaging.

[Conventional technology]

Recently, a radiation image recording and reproducing system for obtaining a radiographic image of a subject such as a human body using a storage phosphor (stimulable phosphor) has been developed and is being widely used for medical diagnosis and the like.

This radiation image recording and reproducing system photoelectrically reads out the stimulable phosphor obtained from a stimulable phosphor sheet that records radiation image information of the human body, etc. to obtain an image signal, and based on this image signal, a photographic light-sensitive material is used. The image is output as a visible image on a recording material such as.

Here, when recording an image on a recording material, for example, an image output laser printer device is used. This device stores X-ray photographic film, which is a recording material, through a magazine, etc., and takes out the film one by one using a sheet-fed mechanism such as a suction cup. It is configured to record a predetermined image by irradiating the X-ray photographic film with laser light based on the signal. When loading the radiation film into the equipment, it must be handled in such a way that it is not exposed to external light, and in order to improve work efficiency, it is necessary to be able to load the film in a bright room. Met.

Hitherto, various techniques have been disclosed that can achieve this purpose (for example, Japanese Utility Model Application Publication No. 56-7931, Japanese Utility Model Publication No.
(Japanese Utility Model Publication No. 1-4911, Japanese Utility Model Publication No. 61-/1912, and Japanese Utility Model Publication No. 61-4913) had problems such as complicated loading work. Therefore, the present applicant would like to solve these conventional problems and propose a package for sheet film that can be easily loaded and provided at low cost (Special Publication No. 50038/1982).

A perspective view of one embodiment of this sheet film packaging body is shown in Fig. 8.
As shown in the figure. In FIG. 8, reference numeral 7'f 1 is a light-shielding tray stand in the form of a housing with an open upper part, and reference numeral 2 is a flexible cover member that is releasably attached to the upper surface of the light-shielding tray stand 1. It is. The light-shielding tray stand 1 is integrally formed with a bottom portion 3 and a side wall portion 4, and the side wall portion 4 defines an opening 5 for taking out a film. Further, a flange portion 6 projecting outward is formed on the upper edge of the side wall portion 4, and a flexible cover member 2 is attached to this flange portion 6 to close the film ejection opening 5. It has become.

This flexible cover member 2 is formed to be more than twice as thick as the length of the tray stand 1, and its end is folded back at approximately the middle portion and is configured to extend outward from the flange portion 6. Further, one of the flange parts 6 is formed to protrude outward for a long time, and a handle hole 7 is formed approximately in the middle of the flange part 6, and a handle 8 is formed at the outer edge. Ribs 9 are formed to protrude in parallel with a predetermined distance apart, and a plate-shaped locking portion 1 is formed on the inner surface of the side wall portion 4 to protrude by a predetermined width into the film ejection opening 5.
0 is formed.

[Problem that the invention seeks to solve]

By the way, the above-mentioned package for photosensitive sheet film was proposed for the first time by the applicant, and is a package that did not exist before.

Therefore, in order to protect the photosensitive sheet film, the flexible cover member of the package for the photosensitive sheet film has moisture-proofing properties, gas barrier properties, and light-shielding properties, and is to the extent that it does not peel off from the tray stand during the loading process. It requires sufficient heat-sealing strength to adhere firmly to the tray, and it also requires sufficient physical strength such as tensile strength and tear strength to prevent it from being cut or torn when peeled from the tray stand within the device.

An object of the present invention is to provide a photosensitive sheet film package provided with a laminated film that is optimal as a flexible cover member for the photosensitive sheet film package.

[Means for solving problems]

The present invention has been made to achieve the above objects,
A light-shielding tray for storing a plurality of photosensitive sheet films in a stacked manner, and a light-shielding flexible light-shielding tray that is removably provided on the light-shielding tray and closes an opening for taking out the film. The flexible cover member includes a heat seal layer containing a polyolefin copolymer resin and having a thickness of 13 to 17 μm, and a flexible sheet laminated on the outside of the heat seal layer. The structure is characterized by comprising a layer and having a light-shielding property.

The heat seal layer of the flexible cover member in the present invention is
Contains polyolefin copolymer resin. As this polyolefin copolymer resin, various polyolefin copolymer resins having good heat sealability are used depending on the resin forming the light-shielding tray stand. For example, linear low-density polyethylene (hereinafter referred to as L-LD) contained in the resin of the light-shielding tray stand
It's called PE. ) resin, ethylene ethyl acrylate (hereinafter referred to as 21 E E A) resin, ethylene vinyl acetate (hereinafter referred to as EV A) resin, or ethylene methyl acrylate (hereinafter referred to as EMA) resin in an amount of 25% by weight. If the amount is less than 6%, EEA resin, EVA resin or EMA resin in which the comonomer copolymerized with ethylene is 6% or more
It is resin. At this time, it is sufficient that the converted amount of the comonomer is 6% or more, and a blended resin of 50% by weight of EEA resin and 50% of LDPE resin with a comonomer content of 18% can be used with a comonomer content of 9%. In addition, L-LDPE resin, EEA resin, and EV resin contained in the resin of the light-shielding tray stand
If the amount of A resin or HMA resin is 25% by weight or more, EE with less than 6% comonomer copolymerized with ethylene
A tree, EVA resin or EMA resin or L-LD
PIs resin or LDPE resin may be used.

The heat seal layer needs to have a thickness of 13 to 70 μm.

If the thickness of the heat-sealing layer is less than 13 μm, the flexible cover member and the light-shielding tray base will not be completely heat-sealed due to warpage, sink marks, or unevenness of the light-shielding tray base, resulting in light leakage or ensuring moisture-proof properties. I can't do it.

Furthermore, even if the product is completely heat-sealed, the sealing strength is low and the heat-sealed portion peels off during transportation, making it impossible to ensure light-shielding and moisture-proofing properties.

If the thickness of the heat-sealing layer exceeds 70 μm, the polyolefin copolymer resin layer will have thick adhesion (stickiness), which may cause blocking or poor peelability from the cooling roll, leading to problems in practical use.

In addition, the heat sealing strength is high, and the adhesive force with the light-shielding tray base is greater than the adhesive strength with the flexible sheet layer, so if you try to make the flexible cover member fJlg, the heat-sealing layer will remain on the light-shielding tray base and various problems will occur. cause trouble.

In addition, the adhesive strength between the heat seal layer and the light-shielding tray base is greater than the strength that prevents the flexible cover member from peeling off from the light-shielding tray base during the storage process, and is at a level that allows the flexible cover member to be easily peeled off during use. It is preferable that the strength is smaller than that of . For example, adhesive strength is 200-3000g/10
m width range.

The flexible sheet layer is laminated to ensure light-shielding properties, moisture-proofing properties, physical strength, etc., and various thermoplastic resin films are used. Particularly preferred are cellophane, biaxially stretched polyester film, nylon film, polypropylene film, high-density polyethylene film, and uniaxially and biaxially molecularly oriented films of these various thermoplastic resin films. Furthermore, in order to prevent wrinkles and to prevent the formation of holes or pinholes due to film melting, it is preferable that the film has high heat resistance.

The flexible cover member including the heat seal layer and the flexible sheet layer has light blocking properties. To ensure this light-shielding property, a light-shielding substance may be added to one or both of the heat-sealing layer, the flexible sheet layer, or the adhesive layer. It is also possible to laminate a layer having a light-shielding property such as a metal foil layer without adding any additives.Laminating this metal foil layer not only ensures light-shielding property but also provides moisture-proofing, antistatic property,
It is preferable in terms of tensile strength and interlayer adhesive strength.

However, if the thickness of the metal foil layer is 9 μm or less, there will be many pinholes, so it is necessary to ensure light-shielding properties in the heat seal layer, flexible sheet layer, etc.

In order to facilitate the peeling of the flexible cover member from the light-shielding tray stand, it is preferable to laminate a release layer on the heat-sealing layer. In this release layer, the adhesive strength between the release layer and the heat-sealing layer is smaller than the adhesive strength between the heat-sealing layer and the light-shielding tray stand and the adhesive strength between other layers of the flexible cover member.

This release layer may be made of polypropylene resin, polyamide resin, or the like, or polyolefin resin containing a large amount of lubricant.

The heat seal layer and flexible sheet layer, as well as the metal foil layer and release layer when laminated, may be laminated with an adhesive layer, laminated by simultaneous multilayer coextrusion, or laminated by a combination of these. good. The adhesive layer may be a thermoplastic resin melt-coated adhesive layer such as various polyolefin resins or ionomers, a dry laminated adhesive layer, or a hot melt adhesive layer, and any adhesive layer can be used depending on the materials used.

The tensile strength of the flexible cover member must be greater than the adhesive strength between the heat-sealing layer and the light-shielding tray stand, preferably 20% or more greater than the adhesive strength.

[For production]

The package for photosensitive sheet film of the present invention has a heat-sealing layer of a flexible cover member that adheres to a light-shielding tray stand, a heat-sealing layer and a flexible sheet layer that ensure physical strength, moisture resistance, etc. Light-shielding properties are also ensured when no light-shielding layer is laminated on the surface.

〔Example〕

An example of the package for photosensitive sheet film according to the present invention will be described based on screens.

1 to 7 are partial cross-sectional views of the flexible cover member of the photosensitive sheet film package.

FIG. 1 shows an example in which a heat seal layer 11 and a light-shielding flexible sheet layer 12a are laminated with an adhesive layer 13 in between.

FIG. 2 shows an example in which a metal foil layer 14 is laminated on a flexible sheet layer 12 via an adhesive layer 13, and a light-shielding heat-sealing layer 11a is directly applied to this metal foil layer 14.

FIG. 3 shows an example in which a metal foil N14 is laminated on a flexible sheet layer 12 via an adhesive layer 13, and a heat seal layer 11 is laminated on this metal foil layer 14 via an adhesive layer 13. be.

FIG. 4 shows an example in which the heat seal layer 11 and the light-shielding flexible seal layer 12a are directly formed by simultaneous two-layer coextrusion.

FIG. 5 shows an example in which a heat-sealing layer 11, a light-shielding flexible sheet layer 12a, and an adhesive layer 13 are directly formed by simultaneous three-layer coextrusion.

FIG. 6 shows a flexible sheet layer 12 and a metal foil layer 14 laminated with an adhesive layer 13, and a release layer 1 formed integrally with a heat seal layer 11 on this metal foil layer 14 by simultaneous two-layer coextrusion.
This shows an example in which two layers of 5 and 16 are laminated via an adhesive layer 13 by simultaneous two-layer coextrusion [16].

FIG. 7 shows a flexible sheet layer 12 and a metal foil layer 14 laminated with an adhesive layer 14, and a release layer 15 formed integrally with the heat seal layer 11 on the metal foil layer 14 as a simultaneous two-layer co-extrusion layer 16. This shows an example in which the layers are directly laminated.

Next, the results of comparing the characteristics of the product of the present invention and the comparative product will be explained.

Invention product 1 The light-shielding tray stand 1 is made of oil furnace carbon blank Rikitsu, 0% by weight, and propylene-ethylene random copolymerized with 3.5% by weight of ethylene and 96.5% by weight of propylene with a melt index of 40g/10 minutes. It consists of 80% by weight of copolymer resin, 0.2% by weight of 1,3,2.4-dihenzylidene sorbitol, and 0.3% by weight of oleic acid amide.

The flexible cover member 2 corresponds to the example shown in FIG.
extrusion laminate i with a thickness of 13 μm using L-LDPE resin, metal 7Ii layer 14 with a thickness of 12 μm
The aluminum foil layer of M, heat seal N1ia, is made of 96.7% by weight of EEA resin manufactured by Nippon Unicar with an ethyl acrylate comonomer content of 18%, 3% by weight of oil furnace carbon blank, and 0.0% of oleic acid amide.
This is an extrusion laminate layer with a thickness of 20 μn1 using a resin consisting of 3% by weight.

In the comparison product, the light-shielding tray stand is the same as the product of the present invention, and the flexible cover member 2 is also different from the product of the present invention, except that LDPE resin and resin are used instead of EEA resin as the resin of the heat seal layer. The configuration and thickness are also the same.

Table 1 shows the comparison results of each characteristic.

Since the comparative cover member 2 could not be heat-sealed to the light-shielding tray base 1, all the characteristics as a package were not achieved, and it could not be put to practical use.

〔Effect of the invention〕

Since the present invention is configured as described above, the flexible cover member is adhered to the light-shielding tray stand with sufficient adhesive strength, and does not peel off during the process of storing items. In addition, it has high physical strength such as tensile strength and tear strength, and does not become punctured or torn during the process of being used.

[Brief explanation of drawings]

1 to 7 are partial cross-sectional views of a flexible cover member used in a photosensitive sheet film package according to the present invention. FIGS. 8 and 9 are perspective views of the package for photosensitive sheet film. l...Light-shielding tray stand, 2...Flexible cover member,
5... Opening for film removal, 11... Heat seal layer, 12... Flexible sheet layer, 13... Adhesive layer, 14... Metal foil layer, 15... Peeling layer. Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 s8 Proceedings 1ti Masato (spontaneous) 1986 +r, December 29th Commissioner of the Patent Office Kuro 1) Akio Tono 1 case Patent application 1986-19253 September 2 Name of the invention Package for photosensitive sheet film 3 Relationship to the case of the person making the amendment Patent applicant address 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Name (520)
) Fuji Photo Film Co., Ltd. 4 Agent Address: 3-21-3-6, Hatchobori 3-chome, Chuo-ku, Tokyo 104
No. 07 No. 6 Contents of amendment (1) The description in the specification has been amended as follows. Correction location Wrong Correct Page 2 8 (j
"Photographic film, etc. [Photographic film, etc. is sensitive to radiation]"
For light and radiation 1 Page 2 10fy r For image recording devices” “For image recording devices and video recording devices” Page 4 ℃) line [5 is defined] “5 is formed” Page 6 8
Line [13-17μmj "13-70uT'rL" 9th page 21te [Film is used "Film is preferred"
``Used'' Page 13, line 2 [Adhesive layer 14J ``Adhesive layer 13'' Page 14, 7 (j ``Shon laminé - ``Jon laminé 1 ~ layer.'' 1- Layer.'' Page 15, line 6 Moisture-proof Deletion of column [Lux and a light-shielding flexible cover member that is releasably installed on the light-shielding tray stand and closes the film take-out opening, the flexible cover member being made of a polyolefin copolymer resin. The thickness including
It is characterized by having a thickness of ~70μ and a seal layer and a flexible sheet layer laminated on the outside of the seal layer to the heat 1, and having a light-shielding property. Packaging body for photosensitive sheet film (2) The photosensitive sheet film according to claim 1, wherein the adhesive strength between the heat seal layer and the light-shielding tray stand is 200 to 3000 g/10 rt+tn width. Packaging body (3) A packaging body for photosensitive sheet film according to claim 1 or 2, wherein a peeling layer 2II is laminated on the outer surface of the P1-seal layer (4) The heat-sealing layer Claims 1 and 2, in which a metal foil layer is laminated between the flexible sheet layer and the flexible sheet layer.
The photosensitive sheet described in Section 3 or Section 3! - Packaging for film

Claims (4)

[Claims] (1) Consisting of a light-shielding tray that stores a plurality of photosensitive sheet films in a stacked manner, and a light-shielding flexible cover member that is removably provided on the light-shielding tray and closes the opening for taking out the film. In the package, the flexible cover member includes a polyolefin copolymer resin and has a thickness of 13 to 1
A package for a photosensitive sheet film, comprising a heat-sealing layer having a thickness of 7 μm and a flexible sheet layer laminated on the outside of the heat-sealing layer, and having light-shielding properties. (2) The package for a photosensitive sheet film according to claim 1, wherein the adhesive strength between the heat seal layer and the light-shielding tray stand is 200 to 3000 g/10 mm width. (3) The package for a photosensitive sheet film according to claim 1 or 2, wherein a release layer is laminated on the outer surface of the heat seal layer. (4) Claims 1 and 2 further include a metal foil layer laminated between the heat seal layer and the flexible sheet layer.
The package for a photosensitive sheet film according to item 1 or 3.