JPH1017058A - Information record medium storage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent paper powder from falling onto a CD stored from a disk case made of wood free paper by forming a foldable cover or a disk storage part on a base surface of a disk storage section made of specified laminated sheet, in which the cover is connected to the base surface and can be folded so as to be superposed on the disk storage section. SOLUTION: A base surface 5 which is larger than a disk of information record medium 4 to be stored is formed on a laminated sheet 3 in which multilayer synthetic paper is stacked on a non-oriented resin film, and an upper fold-back piece 6 and a lower fold-back piece 7 are formed so as to be connected respectively to the surface 5. Disk holding holes 9a, 9b are formed in the central portions of fold lines 6a, 7a, respectively. The information record medium 4 is mounted at the center of the base surface 5 and the pieces 6, 7 are folded back along fold lines 5a, 5b respectively. Further the pieces 6, 7 are folded back again along the lines 6a, 7a and an upper end 4a and a lower end 4b of the medium 4 are inserted into the disk holding holes 9a, 9b. And the fold lines 6a, 7a are restored to their original position to store the medium 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium storage container for accommodating a disk-shaped information recording medium such as a CD, an MD, and an optical disk.

[0002]

2. Description of the Related Art Conventionally, a disc-shaped information recording body such as a compact disc (CD), a mini disc (MD), and an optical disc is stored in a center projection of a vacuum-formed resin disc support. The circular notch was fitted and inserted into a disc case on a flat square cylinder made of pigment coated pulp paper (high quality paper), or housed in a transparent polystyrene injection molded case.

[0003]

However, from such a high-quality paper disk case, paper powder falling from the pulp or pigment coating layer falls on the stored disk such as a CD, and music and the like fall from the disk. When listening to, an error such as noise sometimes occurs, and the hinge strength of the high-quality paper is weak, so that the hinge portion of the disk case is damaged due to repeated use.

[0004]

[Means for Solving the Problems]

SUMMARY OF THE INVENTION In view of the above problems, the present inventor has conducted intensive studies to prevent the cause of errors due to fine paper dust and to increase the strength of hinge parts that can be bent. The present invention has been completed based on the finding that such an error can be solved by using a laminated sheet using the multilayer synthetic paper (B). That is, the information recording medium storage container of the present invention has an inorganic stretched film on one or both sides of a non-stretched resin film support layer (A) containing 60 to 800 μm in thickness and 8 to 55% by weight of inorganic fine powder. a uniaxially stretched film of paper-like layer of a thermoplastic resin containing a fine powder in a proportion of 8-65 wt% (B ^2), the wall thickness to form a biaxially stretched resin film as a substrate layer (B ¹⁾ 30 Formed from a laminated sheet having a thickness of 180 to 1,100 μm obtained by integrally laminating a multilayer synthetic paper (B) having a thickness of 180 to 1,100 μm so that the paper-like layer (B ² ) side forms an outer surface. And, a base surface portion larger than the size of the disk of the information recording medium to be stored, and connected to the upper end side and the lower end side of the base surface portion to form an upper folded piece and a lower folded piece respectively, For each of the upper folded piece and the lower folded piece A disk storage portion formed with a disk holding hole for inserting and gripping a part of an upper end portion and a lower end portion of a disk-shaped information recording medium to be stored; and a base surface portion of the disk storage portion. It is characterized by comprising a cover portion or a disk storage portion which is formed to be freely foldable so as to be connected to the surface portion and to be overlapped with the disk storage portion.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

[Detailed Description of the Invention] [I] Information recording medium storage container (1) Material As a material for forming the information recording medium storage container 1 of the present invention, an inorganic fine powder 2 having a thickness of 60 to 800 µm is used. 8
The inorganic fine powder 2 is coated on one or both sides of the unstretched resin film support layer (A) containing the inorganic fine powder 2 in an amount of from 8 to 65% by weight.
The uniaxially stretched film of the thermoplastic resin containing at a ratio of weight% is used as the paper-like layer (B ² ), and the biaxially stretched resin film is used as the base layer.
The multi-layer synthetic paper (B) having a thickness of 30 to 300 μm formed as (B ¹ ) is integrally laminated so that the paper-like layer (B ² ) side forms an outer surface, and has a thickness of 180 to 1 , 100 μm laminated sheet 3 is used.

(2) Shape The information recording medium storage container 1 of the present invention is a laminated sheet 3 in which a multilayer synthetic paper (B) is laminated on one or both sides of the unstretched resin film support layer (A). For example, as shown in FIGS. 1, 4, 5, and 6, a disk storage unit 8 including a base surface 5, an upper folded piece 6 and a lower folded piece 7, and a fold 10
a, hinged, cut, or punched into a shape basically composed of a cover portion 10 that can be bent freely by a, and further formed with fold portions 5a, 5b, 6a, 7a, 10a.
And disk holding holes 9a and 9b.

[0007] More specifically, as shown in FIG. 1, the base sheet 5 for storing the laminated sheet 3 is larger than the size of the disk of the information recording body 4 to be stored, and the upper end 5 a and the lower end of the base 5. An upper folded piece 6 and a lower folded piece 7 connected to each other from the 5b side, and a fold 5a formed by forming the upper folded piece 6 and the lower folded piece 7 on the upper end 5a and the lower end 5b of the base 5. 5b, the upper folded piece 6 and the lower folded piece 7 were folded again at the folds 6a, 7a to form the shape shown in FIG. 2, and formed at the center of the folds 6a, 7a. The disc-shaped information recording body 4 is grasped by inserting a part of the upper end 4a and a part of the lower end 4b of the disc-shaped information recording body 4 to be stored in the disc holding holes 9a, 9b.

[0008] Such a base surface 5 and a disc holding hole 9
The base surface portion 5c of the base surface portion 5 of the disk storage portion 8 including the upper return piece 6 having the holes 9a and 9b and the lower return piece 7 having the disk holding holes 9a and 9b. The cover portion 10 is formed so as to be connected to the side surface portion 5c. The cover portion 10 is formed to have substantially the same size as the disk storage portion 8 so that the cover portion 10 can be overlapped with the disk storage portion 8 and can be bent freely at the fold portion 5c formed on the side surface portion 5c. Is formed.

[0009] Such an information recording medium storage container 1 of the present invention.
First, as shown in FIG. 1, an information recording body (disk) 4 to be housed in the center of the base surface 5 is placed, and then, at the folds 5a and 5b, the upper folded piece 6 and the lower part are arranged. Each of the folded pieces 7 is bent and further folded again at the folds 6a and 7a, and a part of the upper end 4a and a part of the lower end 4b of the information recording body 4 are inserted into the disc holding holes 9a and 9b. Then, when the fold portion 7a is returned to the original state, a state as shown in FIG. 2 is obtained. Further, the fold portions 6a are returned to the original positions, and the fold portions 6a, 7a
As shown in FIG. 3, a part of the upper end 4a and a part of the lower end 4b of the disc-shaped information recording medium 4 to be stored in the disc holding holes 9a, 9b formed at the center of the disc is inserted. Thereby, the disc-shaped information recording body 4 can be gripped by the disc storage unit 8. However, in this state, the folds 6a and 7a may be opened and the disc-shaped information recording body 4 of the disc storage unit 8 may be released from being gripped. Therefore, the cover 10 is bent at the fold 5c to store the disc. The disc-shaped information recording body 4 of the section 8 can be securely held.

Further, the information recording medium storage container 1 of the present invention comprises:
As shown in FIG. 4, a fold portion 5 d is formed on the side surface portion 5 d side of the base surface portion 5 of the disk storage portion 8 opposite to the side surface portion 5 c side, and a connection is made from the side surface portion 5 d of the base surface portion 5. By forming the second cover portion 11 with the disk storage portion 8
It can be bent freely so that it can be overlapped. Further, the information recording medium storage container 1 of the present invention
As shown in FIG. 5, a fold portion 5d is formed on a side surface 5d side of the base surface portion 5 of the disk storage portion 8 opposite to the side surface portion 5c side, and a side surface 5d side of the base surface portion 5 is formed. Second disk storage part 12 capable of holding disk-shaped information recording body 4
Can be formed. Further, as shown in FIG. 6, the cover portions 10 and 11 can be formed continuously from the disk storage portion 8 and the second disk storage portion 12. However, as shown in FIG. 4, FIG. 5 and FIG. 6, a plurality of disk storage portions may be formed continuously with the disk storage portions 8 and 12, and in this manner, the disk storage portions may be formed. When a plurality of portions 8 and 12 are continuously formed, the cover portions 10 and 1 are not necessarily required.
It is not necessary to form 1.

(3) Folds When manufacturing the information recording medium storage container 1 of the present invention, the folds (hinges) 5a, 5b, 5 formed on the laminated sheet 3 are formed.
The layers c, 5d, 6a and 7a are formed by bending the laminate sheet 3 by a hot press having a hinge or the like. The bent portions 5a, 5b, 5c, 5d, 6a and 7a are preferably annealed by heating to a temperature of 80 to 160 ° C. by a hot press or the like.

[II] Laminated Sheet (1) Layer Structure The laminated sheet 3 constituting the information recording medium storage container 1 of the present invention includes a non-stretched resin film support (A) layer and a It is basically composed of a layer of synthetic paper (B), and is laminated with an adhesive layer (C) and / or a print (D) as required.

(A) Unstretched resin film support (A) The unstretched resin film (A) is prepared by mixing inorganic fine powder 2 with
It is a non-stretched, non-foamed resin film obtained by extruding a thermoplastic resin (A ¹ ) containing 55% by weight, preferably 10 to 50% by weight, from a die and molding. As described above, in the unstretched resin film (A),
The inclusion of the inorganic fine powder 2 has the advantage that the amount of energy at the time of high-frequency heating is small because heat fusion can be performed in a relatively short time by high-frequency heating or the like. Further, there is an advantage that the rigidity of the information recording medium storage container 1 is increased. The unstretched resin film support layer (A) has a thickness of at least 60 μm or more in order to prevent the synthetic paper of the stretched laminated film from shrinking at the time of heat sealing and causing deformation of the information recording medium storage container 1. It is necessary to be. The unstretched resin film (A) may be a laminate with a different resin film or sheet. For example, unstretched resin film
(A) may be laminated with a foamed resin sheet. Also,
It may be a laminate with an unstretched resin film containing no inorganic fine powder 2. The thickness of the unstretched resin film (A) is usually 60 μm or more, preferably 250 to 80 μm.
0 μm, particularly preferably 300 to 500 μm is used.

(B) Multi-layer synthetic paper (B) The multi-layer synthetic paper (B) to be adhered to one or both sides of the non-stretched resin film (A) is, for example, generally 3
A biaxially stretched thermoplastic resin film having pores (voids) 2a as a substrate layer (B ¹ ), and having one or both sides thereof,
It is obtained by laminating a uniaxially stretched film of a thermoplastic resin containing an inorganic fine powder 2 in a proportion of 8-65 wt% as a paper-like layer (B ^2).

The multi-layer synthetic paper (B) has a
Be of two-layer structure of paper-like layer (B ²⁾ to (B ^1), Also, as shown in FIG. 6, the thermoplastic resin uniaxially stretched on the front and back surfaces of the base layer (B ¹⁾ Paper-like layer of film (B ² ), (B ^{2 '} )
Are laminated in a three-layer structure (Japanese Patent Publication No. 46-40794), the paper-like layers (B ² ) and (B ² ) and the substrate layer
(B ¹ ) and another resin film layer (B ³ ) between which three to seven layers of synthetic paper (JP-B-50-29738, JP-B-57-149363, JP-B-56-126155,
Japanese Patent Publication No. 57-181829) or a metal salt of propylene / ethylene copolymer or ethylene / (meth) acrylic acid copolymer (Na, Li, Zn,
K), three or more synthetic papers in which a heat seal layer formed of a resin having a lower melting point than the resin constituting the base layer (B ¹ ) such as chlorinated polyethylene may be used. Such a multi-layer synthetic paper (B) is disclosed in JP-B-46-40794.
JP-A-57-149363, JP-A-57-181
No. 829, which are publicly known. Specifically, Oji Yuka Synthetic Paper Co., Ltd.
G, TPG, KPG, SGC ".

(A) Substrate layer (B ¹ ): biaxially stretched thermoplastic film having microporosity The base used in the multilayer synthetic paper (B) of the disk storage section 8 of the information recording medium storage container 1 of the present invention. As the material layer (B ¹ ), as shown in FIG. 7, a thermoplastic resin film containing 5 to 45% by weight, preferably 10 to 30% by weight of the inorganic fine powder 2 is vertically stretched at a temperature lower than the melting point of the resin. 3.5 to 10 in the direction
Stretching having a large number of fine rugby ball-shaped voids (voids) 2a inside the film obtained by stretching the film by a factor of, preferably 4 to 7 times, and 3.5 to 20 times, and preferably 4 to 12 times in the transverse direction. It is a resin film.

(B) Paper-like layer (B ² ) and paper-like layer (B ^{2 ′} ): uniaxially stretched resin microporous film Paper-like layer (B ² ) and paper laminated on base material layer (B ¹ ) Layer
(B ^{2 ′} ) is a thermoplastic resin film containing 8 to 65% by weight, preferably 15 to 55% by weight of the inorganic fine powder 2 on one or both sides of the base material layer (B ¹ ), having a melting point lower than the melting point of the resin. A uniaxially stretched film obtained by stretching the film in the longitudinal direction at a temperature of 3.5 to 20 times, preferably 4 to 12 times, and when the content of the inorganic fine powder 2 is 8% by weight or more, a fine length This is a uniaxially stretched resin microporous film having many long holes (voids) 2a and having excellent crackability on the film surface and excellent printability and writability. The length of the pores 2a is about the particle size of the inorganic fine powder 2 x the stretching ratio.

Void The multi-layer synthetic paper (B) used in the laminated sheet 3 used as the material of the information recording medium storage container 1 of the present invention has fine voids (voids) 2a inside the film, The porosity is
The porosity calculated by the following equation is 10 to 60%, preferably 1
When it is set to 5 to 50%, the weight (density 0.68 to
1.1 g / cm ³ ), resulting in a strong synthetic paper. Further, even when the container using the hinge is repeatedly opened and closed, the fold portion is not damaged (more than 10,000 times). ρ ₀ : density of the film before stretching ρ: density of the film after stretching

The thickness of the thick said multilayered synthetic paper base layer in (B) (B ¹⁾ is generally 20 to 200 [mu] m, preferably 50 to 150 [mu] m, also, the paper-like layer (B ²⁾ and paper The thickness of the shape layer (B ^{2 '} )
Each is generally from 0.5 to 100 μm, preferably from 0.5 to 5
0 μm. The overall thickness of the multilayer synthetic paper (B) is generally 30 to 300 μm, preferably 60 to 150 μm.
m. Moreover, the thickness of the base layer (B ¹⁾ is multilayered synthetic paper (B) the total thickness preferably from 40 to 99%, particularly preferably preferably occupy 50-80%. Regarding the thickness of the multilayer synthetic paper (B) of the laminate sheet 3, when the thickness of the unstretched resin film support layer (A) is less than 60 μm, improvement in rigidity cannot be expected. When the thickness of the multi-layer synthetic paper (B) is less than 30 μm, it is difficult to manufacture the multi-layer synthetic paper (B), and the surface becomes severe.
Since irregularities remain on the surface of (B), the surface appearance and printability may be affected. The thickness of the unstretched resin film (A) is 60 μm or more, and the thickness of the multilayer synthetic paper (B) is 30 μm.
As described above, the thickness of the laminated body 3 integrally heated and welded is 1
It is preferably at least 80 μm.

(C) Adhering method There are various adhering methods for integrally adhering the multilayer synthetic paper (B) to one or both surfaces of the unstretched resin film support layer (A). However, for example, shown below ~
Is preferred. The resin composition for the unstretched resin film support layer (A) is melt-kneaded in an extruder, and is heated from a metal roll or rubber roll on one side by using the heat while being extruded from a slit die and still maintaining a molten state. Thermal lamination method in which multi-layer synthetic paper (B) is welded under pressure. Unstretched resin film support layer (A) and multi-layer synthetic paper (B)
Is bonded with a hot melt adhesive or a solvent type adhesive. At this time, a known adhesive hot melt adhesive layer (C) is provided on the upper layer of the non-stretched resin film (A) by a co-extrusion method, or a multilayer synthetic paper provided with the hot melt adhesive layer (C).
(B) may be used. The non-stretched resin film support layer (A) is a non-foamed non-stretched film alone, and a thermoplastic resin (A
¹ ) and thermoplastic resins (A ² ) and (A ³ ) each containing 8 to 55% by weight of the inorganic fine powder 2 are melt-kneaded by separate extruders, and supplied to one co-extrusion die. Then, it may be melt-laminated in a die and co-extruded and foamed from the die.

(C) Adhesive layer (C) Using the adhesive layer (C), a multilayer synthetic paper (B) is integrally attached to one or both sides of the non-stretched resin film support layer (A). Examples of the adhesive that may be used at the time of joining include a hot melt adhesive or a solvent-type adhesive. The thickness of such an adhesive layer (C) is generally 1 to 30.
μm, preferably 1-20 μm. Specifically, the application type adhesive is applied in an amount of 1 to ²⁰ g / m ² , preferably ² to 8 g / m ² . The hot melt type adhesive is melt-extruded and laminated, and is heat-sealed to a thickness of 6 to 30 μm, preferably 8 to 20 μm.

(D) Printing (D) The surface of the paper-like layer (B ² ) of the multilayer synthetic paper (B) of the laminate sheet 3 is printed by multicolor offset printing, gravure printing, or the like. A printing layer (D) can be formed.
The printing ink is preferably an offset printing, particularly a multicolor offset printing ink from the viewpoint of appearance. Before the printing layer (D) is formed on the surface of the paper-like layer (B ² ) on the side of the multilayer synthetic paper (B) of the laminate sheet 3, a known primer, for example, polyethyleneimine, An epichlorohydrin adduct of polyamide, a water-soluble acrylic antistatic agent, and the like can be applied.

(2) Thickness Unstretched resin film support layer (A) / adhesive layer (C) / multi-layer synthetic paper (B) / printing (D) or multi-layer synthetic paper (B) / adhesion Agent layer (C) / Unstretched resin film support layer (A) / Adhesive layer
(C) / multi-layer synthetic paper (B) / print (D) or unstretched resin film support layer (A) / multi-layer synthetic paper (B) / print (D) or multi-layer synthetic paper ( B) / Unstretched resin film support layer (A)
The thickness of the laminated sheet 2 composed of / multilayer synthetic paper (B) / printing (D) is 180 to 1,100 μm, preferably 2 to 100 μm.
It is 50 to 500 μm.

(3) Raw Material (A) Unstretched Resin Film Support (A) Thermoplastic Resin The thermoplastic resin used for the unstretched resin film support layer (A) may be low-density, medium-density, or high-density resin. Density polyethylene, polypropylene, ethylene-propylene copolymer, olefin resin such as ethylene or propylene / other α-olefin copolymer, styrene resin such as polystyrene, acrylonitrile / styrene copolymer, acrylonitrile / butadiene / styrene resin , Polyethylene terephthalate, polyamide and the like. Among them, it is preferable to use inexpensive polypropylene or high-density polyethylene. These resins may be used in combination of two or more, or may be a laminate of different resins.

(B) Multilayer Synthetic Paper (B) Thermoplastic Resin The thermoplastic resin used for the multilayer synthetic paper (B) includes propylene homopolymer, propylene / ethylene copolymer, propylene / ethylene / butene 1 copolymer,
Propylene resins such as propylene / butene-1 copolymer and propylene / 4-methylpentene-1 copolymer, linear low-density polyethylene, high-density polyethylene,
Propylene copolymer, ethylene-butene-1 copolymer,
Ethylene resins such as ethylene-4-methylpentene-1 copolymer, polyethylene terephthalate, nylon
Polyamide resins such as 6, nylon-6,6, nylon-6,10, nylon-6,12, and polystyrene can be mentioned. These may be used in combination of two or more.
Among them, it is preferable to use inexpensive polypropylene or high-density polyethylene. Inorganic Fine Powder The inorganic fine powder 2 used for the multi-layer synthetic paper (B) includes heavy calcium carbonate, calcined clay, palm curite, titanium oxide, barium oxide, silica, talc, mica,
Diatomaceous earth and the like can be mentioned. These may be used in combination of two or more. These inorganic fine powders 2 have a particle size of generally 0.03 to 15 μm, preferably 0.1 to 5 μm.

(C) Adhesive layer (C) Using the adhesive layer (C), a multilayer synthetic paper (B) is integrally attached to one or both sides of the non-stretched resin film support layer (A). Examples of the adhesive layer (C) used for the combination include a hot-melt adhesive and a solvent-based adhesive. Hot-melt adhesive Using the adhesive layer (C), a low-density polyethylene is used as a hot-melt adhesive for integrally bonding a multilayer synthetic paper (B) to one surface of an unstretched resin film (A). Linear low-density polyethylene, ethylene / vinyl acetate copolymer (preferably ethylene / vinyl acetate copolymer having a vinyl acetate content of 12% by weight or less), ethylene / acrylic acid copolymer (preferably having an ethylene content of 65 to 65%) 94% by weight of ethylene / acrylic acid copolymer), ethylene / methacrylic acid alkyl ester copolymer, ionomer (metal salt of ethylene / acrylic acid copolymer, or ethylene / acrylic acid copolymer)
Metal salt of methacrylic acid copolymer), ethylene / propylene copolymer, ethylene / propylene / butene-1 copolymer, vinyl chloride / vinyl acetate copolymer, and the like. These may be used in combination of two or more. Solvent-type adhesive : A polyether polyol is used as a solvent-type adhesive for integrally bonding a multilayer synthetic paper (B) to one surface of a non-stretched resin film (A) using the adhesive layer (C). -Polyisocyanate adhesive, polyester polyol-polyisocyanate adhesive and the like can be mentioned. These may be used in combination of two or more.

(D) Printing (D) The above unstretched resin film support layer (A) / multilayer synthetic paper (B)
Or a paper-like layer (B ² ) of a multilayer synthetic paper (B) composed of a laminate composed of: The printing ink to be printed on the surface on the side is a printing ink such as an offset printing ink or a gravure printing ink, and the same printing ink used for these various printings is used. However, among these printing inks, it is preferable to use an offset printing ink, particularly a multicolor offset printing ink from the viewpoint of appearance.

[III] Manufacturing Method of Information Recording Medium Storage Container As shown in FIG. 7, the information recording medium storage container 1 of the present invention has a thickness of 60 to 800 μm and an inorganic fine powder 2 of 8 to 5 μm.
Unstretched resin film support layer containing 5% by weight
On one or both sides of (A), a uniaxially stretched thermoplastic resin film containing inorganic fine powder 2 at a ratio of 8 to 65% by weight is used as a paper-like layer (B ² ), and a biaxially stretched resin film is used as a base material layer.
The multi-layer synthetic paper (B) having a thickness of 30 to 300 μm formed as (B ¹ ) is attached so that the paper-like layer (B ² ) forms the outer surface, and further, the paper-like layer (B ² ) Side is subjected to printing (C) to form a laminate sheet 3 having a thickness of 100 to 1,100 μm. Next, the laminate sheet 3 is die-cut to obtain a T-shaped information recording medium storage container 1. Then, as shown in FIG. 1, the disc-shaped information recording body 4 is placed on the base surface 5 of the disc storage section 8 of the information recording body storage container 1. The upper end 4a and the lower end 4b of the disc-shaped information recording body 4 are bent at the upper end side fold 5a and the lower end fold 5b formed on the upper end 5a and the lower end 5b of the base surface 5. As shown in FIG. 3, the upper end side fold 5a and the lower end side fold 5b
The disc-shaped information recording body 4 is fixed by inserting the disc-shaped information recording body 4 into the disc holding holes 9a and 9b, respectively. Then, the information recording medium storage container 1 is connected to the base surface portion 5 of the disk storage portion 8, and the cover portion 10 formed so as to be overlapped with the disk storage portion 8 is bent to form an information recording medium storage container. 1, the storage of the disc-shaped information recording body 4 is completed.

As described above, the disc-shaped information recording body 4 housed in the information-recording body storage container 1 of the present invention has the upper end 4a and the lower end 4b of the disc-shaped information recording body 4 folded at the upper end side, respectively. Holes 9 for holding discs at eye 4a and lower fold 4b
Since the disc-shaped information recording medium 4 is inserted into the information recording medium storage container 1 and is pushed down from the information recording medium storage container 1, no trouble occurs.

[0030]

The present invention will be described more specifically with reference to the following experimental examples. [I] Evaluation The evaluation of the physical properties in the examples was performed by the following methods. (1) Occurrence of an error The occurrence of an error is determined by storing the CD-disk in the container,
After the ejection was performed 200 times, the CD-disc was set on a CD-player and the music was listened to to judge that there was no noise (o) or a certain (x).

(2) Disc pop-out property The disc pop-out property is as follows. After the operation of storing and taking out the disk in the container 50 times for each of the 10 containers, a neat disk is fixed in the disk storage portion, and If the base part 5 of the fixing part and the folded pieces 6 and 7 were not damaged, but were not damaged (good),
When the disk jumped out or damage was found in the fixed portion of the disk, it was determined to be defective (x).

(3) Offset printing properties Toyo Ink Manufacturing Co., Ltd. offset printing ink "TSP"
-400 "(trade name) and Komori Printing Machine Co., Ltd. offset 4 color printing machine, 4 colors (black, blue, red, yellow) on the front side
Flat plate offset printing was performed, and ink transferability and ink adhesion were evaluated by the following methods. Ink transferability The halftone dot portion of each color was magnified with a magnifying glass (30 times) and the reproducibility of the halftone dot was visually determined. Adhesion of the ink Nichiban Co., Ltd. adhesive tape "Scotch tape" (trade name)
Was strongly adhered to the printing surface, and was quickly peeled off along the printing surface, and the degree of ink detachment from the paper surface was visually determined.

[II] Experimental Examples Example 1 Production of Multi-Layer Synthetic Paper (B) (1) 81 wt% of polypropylene (melting flow rate (MFR) 0.8 g / 10 min, melting point: about 164 to 167 ° C.)
3% by weight of high-density polyethylene and average particle size of 1.5μ
Composition (A) containing 16% by weight of calcium carbonate
Was kneaded in an extruder set at a temperature of 270 ° C.,
The sheet was extruded into a sheet and further cooled to a temperature of 60 ° C. by a cooling device to obtain a non-stretched sheet. After the sheet was heated again to a temperature of 150 ° C., it was stretched five times in the machine direction to obtain a five-fold stretched film.
(2) 54% by weight of polypropylene (melting point: about 164 to 167 ° C.) having an MFR of 0.4 g / 10 min and an average particle size of 1.5 μm
After mixing the composition (B) obtained by mixing 43% by weight of calcium carbonate and 3% by weight of titanium oxide with another extruder, the composition was extruded into a sheet by a die, and the mixture was extruded.
After cooling the 5-fold longitudinally stretched film obtained in the step (1) to a temperature of 60 ° C., it is again heated to a temperature of about 155 ° C. and stretched in a transverse direction by a factor of 7.5 using a tenter. ° C
, Cooled to a temperature of 60 ° C., slit the ears, and formed a three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching) with a thickness of 90 μm (B / A / B = 20 μm).
/ 50 μm / 20 μm) laminated film (porosity 33
%) Was obtained.

After applying a corona discharge treatment to the surface of the three-layer laminated film,
An aqueous solution of the coating agent was solid on both surfaces in 0.05 g / m ² on one side.
(Wall thickness: about 0.1 μm), dried and wound up. The composition of the coating solution was as follows. (a) Mitsubishi Chemical Corporation aqueous solution polyacrylic antistatic polymer "ST-1100" : 100 parts by weight (b) Epichlorohydrin adduct of water-soluble polyamine polyamide (“Kaimen 557” manufactured by Dick Hercules)
H "): 25 parts by weight

Printing Multi-layer synthetic paper coated with such a primer (with a thickness of 9
On the surface of 0.1 μm), characters and patterns were subjected to offset printing using commercially available four-color inks.

Production of Unstretched Resin Film Support (A) On the other hand, propylene homopolymer (melt flow rate (M
FR) 1 g / 10 min "Mitsubishi Polypro MR3") 55 parts by weight, 3 parts by weight of high-density polyethylene, 4 parts by weight of calcium carbonate
Composition containing 0 parts by weight and 2 parts by weight of titanium oxide
After melt-kneading (A ¹ ) and ethylene / propylene copolymer (A ² ) (melt flow rate (MFR) 12 g / 10 minutes) at a temperature of 220 ° C. using separate extruders,
Supply in one die, after laminating in the die, extrude, propylene-ethylene copolymer adhesive layer (A ² )
(Thickness 10μm) / Propylene homopolymer / high density polyethylene / calcium carbonate / titanium oxide blended composition
White sheet layer composed of ^{(A 1) (A 1)} ( thickness 340 .mu.m)
A non-foamed unstretched resin laminated film support (A) having a thickness of 350 μm, which is a laminate of the above, was obtained.

Production of Laminated Sheet A non-foamed non-stretched resin-laminated film support obtained by extrusion from the die on the non-printing surface of the multi-layer synthetic paper (B) on which the printing (D) has been applied. While the (A) is still in the softened state, the unstretched resin-laminated film support (A) is thermally laminated to obtain a print (D) / multi-layer synthetic paper layer (B) (thickness 90. 1 μm) / propylene-ethylene copolymer adhesive layer (A ² ) (thickness 10 μm) and propylene homopolymer / high-density polyethylene / calcium carbonate / titanium oxide combination composition layer (A ¹ ) (thickness 340 μm) Laminated sheet 3 composed of unstretched resin laminated film support (A)
(440.1 μm thick).

Production of Information Recording Body Storage Container The laminated sheet 3 is die-cut, cut into a shape as shown in FIG. 1 and folded at the folds 5a and 5 by hot pressing.
By forming b and 5c, the sheet 3 for an information recording medium storage container was manufactured. The folds 5a and 5b of the upper end 5a of the base 5 of the disk storage portion 8 of the information recording medium storage container sheet 3 are bent inward, and the fold 6a of the upper folded piece 6 is further bent. 2 and a disc-shaped information recording body 4 is formed in the disc holding hole 9a of the upper folded piece 6 thereof.
Part of the upper end portion 4a of the disc-shaped information recording member 4 is inserted in the same manner, and the folded portion 7a of the lower folded piece 7 is bent in the same manner to form a part of the lower end portion 4b of the disc-shaped information recording body 4. Is inserted, and the disc-shaped information recording body 4 is gripped by the disc storage unit 8 as shown in FIG. Further, by folding the fold portion 5c of the base surface portion 5 and overlapping the cover portion 10 with the disk storage portion 8, the upper folded portion 6 and the lower folded portion 7 are formed.
Can be prevented from being released from gripping the disc-shaped information recording body 4 which is opened and stored. Unlike the disk case made of pulp paper, such an information recording medium storage container 1 sometimes causes noise on a stored disk such as a CD due to paper dust such as paper waste during container manufacturing or high-speed printing. Furthermore, there is no error such as the occurrence of troubles such as the bent portion being opened naturally and the stored disk popping out.

Evaluation The obtained information recording medium storage container 1 was evaluated. The results are shown below. Occurrence of error: ○ Disc ejection: ○ Offset printability: Transferability ○, adhesion ○

Comparative Example 1 The same procedure as in Example 1 was carried out except that a sheet made of pulp paper was used instead of the laminated sheet 3 used in Example 1. The results are shown below. Occurrence of error: × Disc ejection property: × Offset printing property: Transferability ○, adhesion ○

[0041]

As described above, the information recording medium storage container of the present invention can be produced in pulp paper by using a laminated sheet using multi-layer synthetic paper (B) instead of using a sheet made of pulp paper. In addition, errors due to paper dust such as paper waste during high-speed printing can be eliminated, and the folded part is formed by hot pressing etc., so the folded part was naturally opened and stored. The occurrence of troubles such as the disk jumping out can be solved.

[Brief description of the drawings]

FIG. 1 is a development view of an information recording medium storage container according to an embodiment of the present invention.

FIG. 2 shows a part of the lower end 4b of the disc-shaped information recording medium 4 in the disc holding hole 9b of the lower folded piece 7 of the disc storage part of the disc in the information recording medium storage container in the embodiment of the present invention. It is a figure showing the state where it was inserted.

FIG. 3 is a diagram showing a state in which the information recording body is gripped by the disk storage part of the information recording body storage container in the embodiment of the present invention.

FIG. 4 is an exploded view of an information recording medium storage container according to another embodiment of the present invention.

FIG. 5 is an exploded view of the information recording medium storage container of the present invention provided with two covers and two disk storages.

FIG. 6 is an exploded view of the information recording medium storage container of the present invention provided with two cover portions and two disk storage portions.

FIG. 7 is a sectional view of a laminate sheet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Information recording body storage container 2 Inorganic fine powder 3 Laminated sheet 4 Information recording body 4a Upper end 4b Lower end 5 Base surface 5a Upper end, fold 5b Lower end, fold 5c Side, fold 5d Side Part, fold 6 Upper folded piece 6a Fold 7 Lower folded piece 7a Fold 8 Disk storage 9a, 9b Disk gripping hole 10 Cover 11 Second cover 12 Second disk storage ( A) Unstretched resin film support layer (B) Multi-layer synthetic paper (B ² ) Paper-like layer (B ¹ ) Base layer

Claims (3)

[Claims] An unstretched resin film support layer (A) having a thickness of 60 to 800 μm and an inorganic fine powder in a proportion of 8 to 55% by weight is coated on one or both sides with an inorganic fine powder of 8 to 65%.
The uniaxially stretched film of the thermoplastic resin containing at a ratio of weight% is used as the paper-like layer (B ² ), and the biaxially stretched resin film is used as the base layer.
The multi-layer synthetic paper (B) having a thickness of 30 to 300 μm formed as (B ¹ ) is integrally laminated so that the paper-like layer (B ² ) side forms an outer surface, and the thickness obtained is 180. ~ 1,10
A base portion formed from a 0 μm laminated sheet and larger than the size of the disc of the information recording medium to be stored;
An upper folded piece and a lower folded piece are formed respectively by being connected to the upper end side and the lower end side of the base surface, and the upper folded piece and the lower folded piece are respectively provided with a disc-shaped information recording body to be stored. A disk storage portion formed with a disk holding hole for inserting and holding a part of an upper end portion and a lower end portion; and a disk storage portion connected to the base surface portion at a base surface portion of the disk storage portion. An information recording medium storage container, comprising: a cover portion or a disk storage portion formed so as to be freely foldable so as to be overlapped with the information storage member. 2. The information recording medium storage container according to claim 1, wherein two or more disk storage portions are connected. 3. The information recording medium storage container according to claim 1, wherein the cover portions are formed on both left and right ends of the disk storage portion.