JPH08295091A - Clear file and manufacture thereof - Google Patents

Abstract

PURPOSE: To increase the use applications by forming a file cover with vivid color and excellent look. CONSTITUTION: A laminated sheet 3 having a thickness of 180 to 1,100μm is formed by so integrally laminating a multilayered synthetic sheet B which has a thickness of 30 to 300μm and in which the uniaxially oriented film of thermoplastic resin containing 8 to 65wt.% of inorganic fine powder is formed as a sheetlike layer B<2> and the biaxially oriented film is formed as a base material layer B<1> on one or both side surfaces of a non-oriented resin film support layer A having a thickness of 60 to 800μm and containing 8 to 55wt.% of inorganic fine powder that the layer B<2> side forms an outer surface. Two stripes of hinges 2b, 2c parallel substantially to the center are provided to form a back part 2a as a file cover 2. Many bags 4 made of transparent thermoplastic resin film formed with openings upward are laminated its inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a stamp sheet book,
The present invention relates to a clear file used as a holder for a catalog, a holder for a single document such as an invoice before receipt, a receipt, and a delivery note.

[0002]

2. Description of the Related Art A clear file for temporarily storing invoices, receipts, catalogs, etc. is formed by heat-sealing a large number of transparent polypropylene bags on a polyolefin file cover containing an inorganic filler or pigment. The structure is as follows. Generally, invoices, receipts, etc. have a receipt date that does not match the issuance date.Therefore, after storing for a certain period of time, taking out and organizing them, and recording them in a book, they are stored only for the period required by tax law. There is. A clear file with a transparent polypropylene bag for such temporary storage,
It is also widely used because it does not wrinkle, does not easily get dirty, and is convenient.

[0003]

However, since the file cover (cover) of the conventional clear file is made of polypropylene, only the single-color gravure printing can be applied. Therefore, the file cover of the obtained clear file is However, the colors were not vivid and the appearance did not look good, so there were restrictions on the expansion of its applications.

[0004]

[Means for Solving the Problems]

[Summary of the Invention] The inventors of the present invention have conducted intensive studies in view of the above problems, and as a result, as the file cover (cover) 2 of the clear file 1, the inorganic fine powder 6 having a wall thickness of 60 to 800 μm is 8 to 8 μm. On one or both sides of the non-stretched resin film support layer (A) containing 55% by weight, a uniaxially stretched thermoplastic resin film containing inorganic fine powder in a proportion of 8 to 65% by weight is used as a paper-like layer ( B ² ) and a biaxially stretched resin film formed as a base material layer (B ¹ ) with a thickness of 30 to 300 μm.
Meat obtained by laminating m of the multi-layer synthetic paper (B) so that the paper-like layer (B ² ) side forms the outer surface, and printing (D) on the paper-like layer (B ² ) side. Two hinge portions 2 parallel to the substantially central portion 3c of the laminate sheet 3 having a thickness of 180 to 1,100 μm
File cover 2 having b and 2c to form a back portion 2a
By using the multi-color offset printing and gravure printing, etc. on the surface of the file cover 2
Since it is possible to perform (D), the present invention has been completed based on the finding that the file cover 2 of the clear file 1 having a vivid and beautiful appearance can be obtained.

That is, the clear file of the present invention is
Non-stretched resin film support layer (A) having a thickness of 60 to 800 μm and an inorganic fine powder content of 8 to 55% by weight, and an inorganic fine powder content of 8 to 65% by weight on one or both sides. The uniaxially stretched film of thermoplastic resin
² ) and a biaxially stretched resin film as a base material layer (B ¹ ), a multilayer synthetic paper (B) having a wall thickness of 30 to 300 μm is formed so that the paper-like layer (B ² ) side forms the outer surface. A file cover 2 in which two hinges 2b, 2c are provided in parallel with a substantially central portion 3c of a laminated sheet 3 having a wall thickness of 180 to 1,100 μm laminated together to form a back portion 2a, and the file cover 2 A large number of bags 4 made of a transparent thermoplastic resin film laminated on the inner side of the sheet and having an opening 4a formed above.
And a central portion 4b of the bag 4 is integrally fused to the inside of the back portion 2a of the file cover 2, and a paper-like layer (B ² ) on the outside of the file cover 2
The side is characterized by being printed (D).

The method for manufacturing a clear file, which is another invention of the present invention, has a wall thickness of 60 to 800 μm,
Uniaxially stretched thermoplastic resin containing inorganic fine powder in the proportion of 8 to 65% by weight on one or both sides of the unstretched resin film support layer (A) containing the inorganic fine powder in proportion of 8 to 55% by weight. The film is used as a paper-like layer (B ² ) and the biaxially stretched resin film is used as a base material layer (B ¹ ) having a thickness of 30 to 30.
A multi-layered synthetic paper (B) of 0 μm is laminated integrally so that the paper-like layer (B ² ) forms the outer surface, and the thickness is 180 to 1,
After forming the laminate sheet 3 having a thickness of 100 μm, printing (D) is performed on the paper-like layer (B ² ) side of the laminate sheet 3, and two hinge portions parallel to the substantially central portion 4b of the laminate sheet 3 are formed. 2b,
2 c is provided to form a back portion 2 a to form a file cover 2, and a large number of transparent thermoplastic resin film bags 4 each having an opening 4 a formed therein are laminated inside the back portion 2 a of the file cover 2. Then, the die 10a of the high-frequency heating device 10 is brought into contact with the central portion 4b of the bag 4 and the back portion 2a,
It is characterized in that the back portion 2a and a large number of bags 4 are integrally heat-sealed in a laminated state.

[Detailed Description of the Invention] [I] Clear File (1) Shape As shown in FIG. 1, the clear file 1 of the present invention includes a large number of transparent thermoplastic resin films on the file cover 2, for example. The bags 4 are laminated, and the central portion 4b of the bags 4 is integrally formed on the back surface side of the back portion 2a of the file cover 2 by heat fusion 7 such as high frequency heating.

(2) Manufacturing method As shown in FIG. 2, first, an unstretched resin film support layer (A) having a wall thickness of 60 to 800 μm and containing inorganic fine powder 6 in a proportion of 8 to 55% by weight is prepared. A uniaxially stretched film of a thermoplastic resin containing inorganic fine powder 6 in a proportion of 8 to 65% by weight on one or both sides is a paper-like layer (B ² ), and a biaxially stretched resin film is a base material layer (B ¹ ). Thickness of 30-30
A 0 μm multi-layered synthetic paper (B) is laminated so that the paper-like layer (B ² ) forms an outer surface, and further printed on the paper-like layer (B ² ) side which is the outside of the file cover 2 ( D) is applied and the wall thickness is 1
A laminated sheet 3 having a thickness of 80 to 1,100 μm is formed, and two hinge portions 2b, 2c parallel to the substantially central portion 3c of the laminated sheet 3 are provided to form the back portion 2a to form the file cover 2. Then, as shown in FIG. 1, an unstretched resin film support layer inside the file cover 2.
On the (A) side, a large number of transparent thermoplastic resin film bags 4 each having an opening 4a formed above are laminated, and the central portion 4b of the bags 4 is the back side of the back portion 2a of the file cover 2. Then, it can be manufactured by being integrated by heat fusion 7 such as high frequency heating. When the multi-layer synthetic paper (B) is provided on both sides of the unstretched film support layer (A), the bag is heat-melted on the paper-like layer (B ² ) side of the multi-layer synthetic paper (B). It will be a worn structure.

[II] File cover (laminate sheet) (1) Layer structure (A) Non-stretched resin film support layer (A) File cover 2 (laminate sheet 3) constituting the clear file 1 of the present invention Non-stretched resin film support layer (A) containing inorganic fine powder 6 in a proportion of 8 to 55% by weight
Is 8 to 55% by weight of the inorganic fine powder 6, preferably 10
Thermoplastic resin (A ¹ ) containing in an amount of up to 50% by weight
Is a non-stretched, non-foamed resin film obtained by extruding from a die. As described above, when the inorganic fine powder 6 is contained in the unstretched resin film support layer (A), it can be heat-fused in a relatively short time by high frequency heating or the like. It has the advantage of low energy consumption. Further, there is an advantage that the rigidity of the file cover 2 is increased. The unstretched resin film support layer (A) needs to have a wall thickness of at least 60 μm or more in order to prevent the synthetic paper of the stretched laminated film from shrinking due to heat fusion and deformation of the file cover 2. Is. The unstretched resin film support layer (A) may be a laminate of different resin films or sheets. For example, the unstretched resin film support layer (A) may be laminated with a foamed resin sheet. It may be a laminate with an unstretched resin film containing no inorganic fine powder. The thickness of the unstretched resin film support layer (A) is usually 60 μm or more, preferably 250 to 800 μm, and particularly preferably 300 to 500 μm.

(B) Multi-layer synthetic paper layer (B) The multi-layer synthetic paper (B) attached to the above-mentioned unstretched resin film support layer (A) has, for example, a wall thickness of generally 30 to 300 μm.
m, preferably 60 to 150 μm, and the holes 5
Biaxially stretched thermoplastic resin film having (void) 5 is used as a base material layer (B ¹ ), and uniaxially stretched thermoplastic resin containing inorganic fine powder 6 in a proportion of 8 to 65% by weight on one side or both sides thereof. A film is laminated as a paper-like layer (B ² ). This multi-layer synthetic paper (B) has a two-layer structure in which the paper-like layer (B ² ) is laminated on the base material layer (B ¹ ) as described above, and as shown in FIG. base layer thermoplastic resin uniaxially stretched paper-like layer of the film on the front and back surfaces of the (B ¹⁾ (B ^2), those of (B ^{2 ')} the laminated three-layer structure (see JP-B-46-40794) Even if there is this paper-like layer (B ² ), (B ^{2 ′} ) and the base material layer
(B ¹⁾ synthetic paper having a three-layer-seventh layer of another resin film layer (B ³⁾ is present between (JP-B-50-29738, JP-B-57-149363, JP-B-56-126155,
Japanese Patent Publication No. 57-181829), or the backside thereof is a metal salt of propylene / ethylene copolymer or ethylene / (meth) acrylic acid copolymer (Na, Li,
It may be a synthetic paper having three or more layers in which a heat seal layer formed of a resin having a melting point lower than that of the resin constituting the base material layer (B ¹ ) such as Zn, K) or chlorinated polyethylene is laminated. Such a multi-layer synthetic paper (B) can be obtained by using the aforementioned Japanese Patent Publication No. 46-407.
94, JP-A-57-149363, and JP-A-57-1.
It is known as described in each publication of No. 81829, and specifically, it is specifically described in "Yupo FP" by Oji Yuka Synthetic Paper Co., Ltd.
G, TPG, KPG, SG ”are already sold.

Substrate layer (B ¹ ): Biaxial stretching heat having micropores
Plastic film As the base material layer (B ¹ ) used in the multi-layer synthetic paper layer (B) of the file cover 2 of the clear file 1 of the present invention, as shown in FIG. %, Preferably 10 to 30% by weight, of the thermoplastic resin film at a temperature lower than the melting point of the resin in the longitudinal direction of 3.5.
-10 times, preferably 4-7 times, 3.5-20 in the lateral direction
It is a stretched resin film having a large number of fine rugby ball-shaped holes 5 (voids) 8 inside the film obtained by stretching the film 4 times, preferably 4 to 12 times.

Paper-like layer (B ² ) and paper-like layer (B ^{2 '} ): Uniaxial stretching
Resin microporous film Paper-like layer (B ² ) and paper-like layer laminated on the base material layer (B ¹ )
(B ^{2 ')} is 8-65% by weight of an inorganic fine powder 6 on one side or both sides of the base layer (B ^1), preferably lower than the melting point of the resin of the thermoplastic resin film containing 15 to 55 wt% A uniaxially stretched film obtained by stretching 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 6 is 8% by weight or more, a fine long film is formed inside the film. It is a uniaxially stretched resin microporous film having a large number of elongated pores (voids) 5 and having cracks on the film surface, which is excellent in printability and writability. The length of the pores 5 is approximately the particle diameter of the inorganic fine powder 6 × the draw ratio.

Void The multi-layer synthetic paper layer (B) used in the file cover 2 of the clear file of the present invention has fine voids (pores) inside the film, and the porosity is calculated by the following formula. When the generated porosity is set to 10 to 60%, preferably 15 to 50%, it is lightweight (density 0.68 to 1.1 g / cm2).
^{In 3} ), it becomes a strong synthetic paper. ρ ₀ : Density of film before stretching ρ: Density of film after stretching

[0014] thickness above multilayered synthetic paper (B) substrate in layer (B ¹⁾ of the wall thickness generally 20 to 200 [mu] m, preferably 50 to 150 [mu] m, also, the paper-like layer (B ²⁾ and a paper-like The thickness of the layer (B ^{2 ′} ) is generally 0.5 to 100 μm, preferably 0.5 to 50 μm.
μm. The total thickness of the multi-layer synthetic paper (B) is generally 30 to 300 μm, preferably 60 to 150 μm.
Is. Moreover, the thickness of the base material layer (B ¹ ) preferably occupies 40 to 99%, particularly preferably 50 to 80% of the total thickness of the multilayer synthetic paper (B). The thickness of the composite synthetic paper (B) of the file cover 2 varies depending on the purpose and application, but the thickness of the unstretched resin film support layer (A) is 60 μm.
If it is less than m, improvement in rigidity cannot be expected. Multi-layer synthetic paper
When the wall thickness of (B) is less than 30 μm, it is difficult to manufacture and the surface becomes very uneven, and therefore even after heat-melting integrally, the surface of the multi-layer synthetic paper layer (B) has unevenness. Since it remains, the surface appearance and printability may be impaired. The thickness of the unstretched resin film support layer (A) is 60 μm or more, the thickness of the multi-layer synthetic paper layer (B) is 30 μm or more, and the thickness of the laminated body 2 integrally heat-welded is 180 μm. The above is preferable.

[0015] one or both sides of the attaching method unstretched resin film support layer (A), as the sticking method for bonding multilayer synthetic paper (B) together, there are various methods, for example, ,It is shown below~
Is preferred. The resin composition for the non-stretched resin film support layer (A) is melt-kneaded in the extruder, and the heat is utilized while being extruded from the slit die and still being in the molten state, and the metal roll or the rubber roll is applied to one side. Thermal laminating method in which multi-layer synthetic paper (B) is welded under pressure. Non-stretched resin film support layer (A) and multilayer synthetic paper (B)
There is a method of sticking with a hot melt adhesive or a solvent type adhesive. At this time, a publicly known adhesive hot melt adhesive layer may be provided on the non-stretched resin film (A) by a coextrusion method, or a multilayer synthetic paper (B) having a hot melt adhesive layer may be used. The unstretched resin film support layer (A) is composed of a non-foamed unstretched film alone, and a thermoplastic resin (A
¹ ) and the thermoplastic resin (A ² ) and (A ³ ) containing 8 to 55% by weight of the inorganic fine powder 6 are melt-kneaded by separate extruders, respectively, and these are supplied to one co-extrusion die. Then, it may be melt-laminated in the die and coextruded and foamed from the die.

(C) Adhesive Layer (C) Using the above 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 type adhesive. The thickness of such an adhesive layer is generally 1 to 30 μm,
It is preferably used in a thickness of 1 to 20 μm. Specifically, the coating type adhesive is 1 to 20 g / m ² , preferably 2
It is applied in an amount of ˜8 g / m ² . The hot-melt type adhesive is melt-extrusion laminated and heat-sealed to a thickness of 6 to 30 μm, preferably 8 to 20 μm.

(D) Printing Layer (D) At least the outer surface of the paper-like layer (B ² ) of the file cover 2 on the side of the multilayer synthetic paper layer (B) of the laminate sheet 3,
Printing is performed by multicolor printing such as offset printing or gravure printing to form a printing layer (D). The printing ink is preferably offset printing, particularly multicolor offset printing ink from the viewpoint of appearance. On the surface of the paper-like layer (B ² ) on the side of the multilayer synthetic paper layer (B) of the laminate sheet 3, the printing layer (D)
Prior to the formation of known primers, for example,
Polyethyleneimine, an epichlorohydrin adduct of polyamide, etc. can be applied.

(E) Thickness of laminated sheet Non-stretched resin film support layer for the file cover 2
(A) / adhesive layer (C) / multi-layer synthetic paper layer (B) / printing layer (D),
Or multi-layer synthetic paper (B) / adhesive layer (C) / non-stretched resin film support layer (A) / adhesive layer (C) / multi-layer synthetic paper layer (B) /
The thickness of the laminate sheet 2 composed of the printing layer (D) is 1
80 to 1,100 μm, preferably 250 to 500 μm
belongs to.

(2) Base material (A) Non-stretched resin film support layer (A) The thermoplastic resin used for the non-stretched resin film support layer (A) has low density, medium density and high density. Olefin resin such as polyethylene, polypropylene, ethylene / propylene copolymer, ethylene or propylene / other α-olefin copolymer, polystyrene, acrylonitrile / styrene / styrene resin such as acrylonitrile / butadiene / styrene resin, polyethylene Examples thereof include terephthalate and polyamide. Among these, it is preferable to use inexpensive polypropylene or high-density polyethylene. These resins may be used in combination of two or more kinds, or may be a laminated body of different resins.

(B) Multi-layer Synthetic Paper Layer (B) Thermoplastic Resin The thermoplastic resin used in the above-mentioned multi-layer synthetic paper (B) includes propylene homopolymer, propylene / ethylene copolymer, propylene / ethylene / butene. -1 copolymer,
Propylene-based resins such as propylene / butene-1 copolymer and propylene / 4-methylpentene-1 copolymer; linear low density polyethylene, high density polyethylene, ethylene
Propylene copolymer, ethylene-buden-1 copolymer,
Ethylene-based resins such as ethylene-4-methylpentene-1 copolymer; polyethylene terephthalate; nylon-
6, polyamide resin such as nylon-6,6, nylon-6,10, nylon-6,12; polystyrene and the like. These may be used in combination of two or more.
Among these, it is preferable to use inexpensive polypropylene or high-density polyethylene.

Inorganic fine powder The inorganic fine powder 6 used in the above-mentioned multi-layer synthetic paper layer (B) includes heavy calcium carbonate, calcined clay, permculite, titanium oxide, barium oxide, silica stone, talc, mica, diatomaceous earth. Etc. can be mentioned. These may be used in combination of two or more. The inorganic fine powder 6 has a particle size of generally 0.03 to 15 μm, preferably 0.1 to 5 μm.

(C) Adhesive Layer (C) Using the above adhesive layer (C), a multilayer synthetic paper layer (B) is integrally formed on one side or both sides of the non-stretched resin film support layer (A). Examples of the adhesive layer (C) used for bonding include a hot melt adhesive and a solvent type adhesive. Hot-melt adhesive A low-density hot-melt adhesive for integrally bonding the multi-layer synthetic paper layer (B) on one side of the unstretched resin film (A) using the adhesive layer (C). Polyethylene, 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 ethylene content of 65) To 94% by weight of ethylene / acrylic acid copolymer), ethylene / methacrylic acid alkyl ester copolymer, ionomer (metal salt of ethylene / acrylic acid copolymer, or ethylene.
Examples thereof include metal salts of methacrylic acid copolymers), ethylene / propylene copolymers, ethylene / propylene / butene-1 copolymers, vinyl chloride / vinyl acetate copolymers, and the like. These may be used in combination of two or more.

Solvent-type Adhesive As a solvent-type adhesive for integrally bonding the multi-layer synthetic paper layer (B) to one surface of the non-stretched resin film (A) using the adhesive layer (C) , Polyether polyol / polyisocyanate adhesive, polyester polyol / polyisocyanate adhesive, and the like. These may be used in combination of two or more.

(D) Print layer (D) Non-stretched resin film support layer (A) / multi-layer synthetic paper layer
Of a laminate or a multi-layer synthetic paper layer (B) / a non-stretched resin film support layer (A) / a multi-layer synthetic paper layer (B) The printing ink to be printed on the surface on the side of the paper-like layer (B ² ) is a printing ink such as an offset printing ink or a gravure printing ink, and the same printing inks used for these various printings can be 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] Transparent thermoplastic resin film file (1) Shape The bag 4 used as a thermoplastic resin film file fused inside the file cover 2 has an opening 4a formed at the top. Bag 4 with a typical thickness of 8 to 1
Those having a diameter of 00 μm, preferably 20 to 50 μm, and a degree of haze of generally 5% or less, preferably 0.1 to 3% are used.

(2) Thermoplastic resin As the thermoplastic resin forming the transparent bag 4, olefins such as low density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene or propylene / other α-olefin copolymer are used. Examples thereof include resin, polyethylene terephthalate, polyamide and the like. Among these, polypropylene, polyethylene terephthalate, and polyamide are preferably used. Usually, these are used by stacking 5 to 30 sheets, preferably about 10 to 20 sheets. The central portion 4b of these bags 4 is integrated with the inside of the back portion 2a of the file cover 2 by heat fusion 7.

[IV] Manufacture of Clear File The above laminated sheet 2 is cut into various shapes, and hinge processing is performed by a die press or the like to form a back portion, which can be used as a clear file file cover (cover) 2. . (1) Cutting Cutting of the laminate sheet 2 is generally performed by a press machine having a cutter blade.

(2) Formation of the back part The substantially central part 2 of the clear file file cover 2
The d is bent by a heat press or the like having a hinge to provide two folds (hinge) 2b and 2c parallel to the upper end side and the lower end side of the file cover 2 to form the back portion 2a. Fold 1 of the file cover 2 for the above-mentioned clear file
When bending the file cover 2, bend at b.
It is preferable to perform the annealing treatment by heating to a temperature of 0 to 160 ° C.

(3) Heat-sealing Inside the file cover 2, a large number of transparent thermoplastic resin film bags 3 having openings 5a formed above are provided.
The central portion 4b of the bag 4 is laminated so as to overlap the back surface side of the back portion 2a of the file cover 2, and the die 10a of the high frequency heating device 10 is brought into contact with this portion to apply a high frequency to the back portion 2a. And a large number of transparent bags 4 made of a thermoplastic resin film are laminated and integrally fused.
In addition to high frequency heating, ultrasonic sealing can also be utilized.

High-frequency heating Examples of the high-frequency heating include dielectric heating, induction heating, and microwave heating, but it is preferable to perform bonding by dielectric heating, particularly by heating the bonding surface of dielectric heating.
Without using the adhesive layer (C), the back part 2 and the large number of bags 4 are laminated, and the electrodes are brought into contact with the upper and lower surfaces of the stacked parts and a voltage is applied, so that they are heated by a high frequency. It can be melted and fused and easily bonded. The condition of high frequency heating is usually within the following range. Ampere: 1 to 30 A Voltage: 100 V or 200 V Power: 48 to 3,000 W Frequency: 10 to 60 kHz, preferably 10 to 20 k
Hz amplitude: 1.2 to 22 (O-P μm), preferably 1
1 to 22 (O-Pm) application time: 0.05 seconds to 10 seconds, preferably 0.1 to 3
Second

[0031]

EXAMPLES The present invention will be described in detail below with reference to examples of the present invention. [I] Evaluation Physical properties in the examples were evaluated by the following methods. (1) Peel strength The T-type peel strength of the adhesive part (15 mm width) was measured.

(2) Appearance The surface (unevenness) of the laminated sheet was visually inspected and judged according to the following criteria. In addition, the distortion of the file cover was visually inspected to determine the presence or absence thereof. ◯: No problem in practical use. Δ: There are some problems in practical use. X: Not practical

(3) Offset printing property Offset printing ink "TSP" manufactured by Toyo Ink Mfg. Co., Ltd.
-400 "(trade name) and an offset four-color printing machine manufactured by Komori Printing Co., Ltd., and four colors (black, blue, red, yellow) on the surface side.
Flat plate offset printing was performed, and the ink transferability and ink adhesion were evaluated by the following methods. Ink transferability The dot portion of each color was visually evaluated with magnifying paper (30 times) on magnified paper and dot reproduction. Halftone dot reproducibility: 100 to 75% Good (○) 75 to 50% Somewhat bad (△) 50 to 0% Poor (x) Ink adhesion Nichiban Co., Ltd. adhesive tape "Cellotape" (trade name)
Was strongly adhered to the printed surface and quickly peeled off along the printed surface, and the degree of ink detachment from the paper surface was visually judged. Ink residue rate: 100 to 95% Good (○) 95 to 80% Slightly bad (△) 80 to 0% Bad (x)

[II] Experimental Example Example 1 Production of multi-layer synthetic paper (B) (1) 81% by weight of polypropylene (melting point about 164-167 ° C.) with melt flow rate (MFR) 0.8 g / 10 min
High density polyethylene 3% by weight and average particle size 1.5μ
Composition (A) in which 16% by weight of calcium carbonate of m is mixed
Was kneaded with an extruder set at a temperature of 270 ° C.,
It was extruded into a sheet shape and further cooled to a temperature of 60 ° C. by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 150 ° C., and then stretched 5 times in the longitudinal direction to obtain a 5 times longitudinally stretched film. (2) Polypropylene having a MFR of 0.4 g / 10 min (melting point of about 164-167 ° C.) 54% by weight and an average particle size of 1.5 μ
The composition (B) in which 43% by weight of calcium carbonate of 3 m and 3% by weight of titanium oxide were mixed and kneaded in another extruder, and then extruded into a sheet by a die.
The 5 × longitudinally stretched film obtained in the step (1) was cooled to a temperature of 60 ° C., heated again to a temperature of about 155 ° C., and stretched 7.5 times in a transverse direction by using a tenter to give 163 ℃
Annealing treatment at a temperature of 60 ° C., cooling to a temperature of 60 ° C., slits in the ears, and a three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching) with a wall thickness of 90 μm (B / A / B = 20 μm).
/ 50 μm / 20 μm) laminated film (porosity 33
%) To obtain a multi-layer synthetic paper (B).

Primer coating After the surface of this three-layer laminated film was subjected to corona discharge treatment,
0.05 g / m ² solid solution on both surfaces of coating solution
It was coated and dried to have a wall thickness of about 0.1 μm, and wound up. The composition of the coating agent aqueous solution was as follows. (a) Mitsubishi Chemical Corporation aqueous solution polyacrylic antistatic polymer "ST-1100" (

[0036]

Embedded image

100 parts by weight (b) Epichlorohydrin adduct of water-soluble polyamine polyamide (Kymene 557 manufactured by Dick Hercules Co., Ltd.)
H "): 25 parts by weight

Printing Multilayer synthetic paper (thickness 9
On the surface of 0.1 μm), characters and patterns were offset printed using commercially available four color inks.

Production of unstretched resin film support (A) On the other hand, propylene homopolymer (melt flow rate (M
FR) 0.5g / 10 minutes "Mitsubishi Polypro MR3") 55
A composition in which 3 parts by weight of high-density polyethylene, 40 parts by weight of calcium carbonate and 2 parts by weight of titanium oxide are mixed in parts by weight.
(A ¹ ) and the ethylene / propylene copolymer (A ² ) (melt flow rate (MFR) 12 g / 10 minutes) were melt-kneaded at a temperature of 220 ° C. in separate extruders, respectively,
Supply into one die, stack in the die, and then extrude, propylene-ethylene copolymer adhesive layer (A ² )
(Wall thickness 10 μm) / 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 non-stretched resin laminate film support (A) having a thickness of 350 μm, which is a laminate of the above, was obtained.

Manufacture of file cover (laminate sheet) Non-foaming unstretched resin obtained by extruding from the die on the non-printing surface of the multi-layer synthetic paper (B) on which the printing (D) is applied. By thermally laminating the unstretched resin laminated film support (A) while the laminated film support (A) is still in a softened state, printing (D) / multi-layer synthetic paper layer (B) ( Wall thickness 90.1 μm) / Propylene / ethylene copolymer adhesive layer (A ² ) (wall thickness 10 μm) and propylene homopolymer / high density polyethylene / calcium carbonate / titanium oxide compound composition layer (A ¹ ) (wall thickness Laminated sheet 3 consisting of non-stretched resin laminated film support (A)
(Wall thickness 440.1 μm) was manufactured. The laminate sheet 3 was cut to obtain a file cover 2 (cover) for a clear file.

Manufacture of clear file As shown in FIG. 1, the file cover 2 is bent at two folds (hinge) parallel to the lower end of the file cover 2 at folds 3a and 3b indicated by dotted lines. After forming the back portion 2a of the file cover 2, a transparent polypropylene resin film bag having an opening formed above the back portion 2a of the file cover 2 (thickness 20 μm
m), 20 sheets are laminated, and then the die of the high-frequency heating device is attached to the central portion 4b of the bag 4 corresponding to the back side of the back portion 2a of the file cover 2 from the polypropylene resin film bag side. They were brought into contact with each other and heat-fused under the high-frequency heating conditions shown below to produce the clear file shown in FIGS. 1 and 2. High frequency heating conditions Ampere: 30A Voltage: 200V Power: 200W Frequency: 15.15kHz Vibration: 22 (O-Pμm) Application time: 1 second

Evaluation The obtained clear file was evaluated. The results were as follows. Peel strength: 2,500 g / 15 mm width Appearance: ○ Offset printability: Transferability ○, Adhesiveness ○

Example 2 Production of multi-layer synthetic paper (B) (1) 81% by weight of polypropylene (melting point about 164-167 ° C.) with melt flow rate (MFR) 0.8 g / 10 min
High density polyethylene 3% by weight and average particle size 1.5μ
Composition (A) in which 16% by weight of calcium carbonate of m is mixed
Was kneaded with an extruder set at a temperature of 270 ° C.,
It was extruded into a sheet shape and further cooled to a temperature of 60 ° C. by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 150 ° C., and then stretched 5 times in the longitudinal direction to obtain a 5 times longitudinally stretched film. (2) Polypropylene having a MFR of 0.4 g / 10 min (melting point of about 164-167 ° C.) 54% by weight and an average particle size of 1.5 μ
The composition (B) mixed with 46% by weight of calcium carbonate of m was kneaded in another extruder, and then extruded into a sheet by a die, which was obtained in the step (1) above. After cooling the double longitudinally stretched film to a temperature of 60 ° C.,
It is heated again to a temperature of about 155 ° C., stretched 7.5 times in the transverse direction using a tenter, annealed at a temperature of 163 ° C., cooled to a temperature of 60 ° C., and the ears are slit. Three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching) thickness 90 μm (B / A / B = 20 μm / 50 μm / 20 μ)
A multi-layered synthetic paper (B) composed of the laminated film (m) having a porosity of 33% was obtained.

Primer coating After corona discharge treatment of the surface of this three-layer laminated film,
The aqueous solution of the coating agent used in Example 1 was applied on both surfaces so that the solid content was 0.05 g / m ² on one side (thickness of about 0.1 μm), dried, and wound up.

Manufacture of non-stretched resin film support (A) Propylene / ethylene block copolymer (MFR 0.5 g / 10 min "Mitsubishi Polypro EC
9 ": trade name) 100 parts by weight of 3.5 parts by weight of a 1: 1 mixture of monosodium citrate and sodium hydrogencarbonate as a chemical foaming agent to form a foaming resin (A ² ) having a diameter of 65 mm. It was melt-kneaded by an extruder. On the other hand, 100 parts by weight of propylene / ethylene block copolymer (MFR 1.8 g / 10 min "Mitsubishi Polypro BC8": trade name) was mixed with 40 parts by weight of talc as a filler, and the mixture was heated at 210 ° C in an extruder with a diameter of 90 mm. Melt kneading at temperature. Then, the former is used as an intermediate layer and the latter is used as both outer layers to be laminated in three layers by a feed block, and then the thermoplastic resin extruded foam layer (A ²⁾ is obtained by coextruding from a T die having a width of 750 mm to foam the intermediate layer. Unstretched resin film support having
I got (A). At this time, unstretched resin film support (A)
The non-foamed resin layer (A ¹ ) had a thickness of 50 μm, the foamed resin layer (A ² ) had a thickness of 200 μm, and the total thickness was 300 μm.

Production of file cover (laminate sheet) Non-stretched resin film support extruded from the T die
At a temperature of 180 ° C. at which (A) is still in the softened state, the multilayer synthetic paper (B) is thermally laminated on the back surface of the multilayer synthetic paper layer (B) (thickness 60. 1μ
m) / non-stretched resin film support layer (A) (thickness 300μ
m, and the foaming ratio of the foamed resin layer was 1.5 times, to obtain a laminated film (thickness 360.1 μm).

[0047] was subjected to printing multilayered synthetic paper layer of the laminated film (B) side offset multicolor printing in (D).

Manufacture of clear file The laminated film (printing layer (D) / multi-layer synthetic paper layer (B) / non-stretched film support layer) on which this printing was carried out in the same manner as in Example 1
(A)) was hinged and the bag 4 was subjected to high-frequency heat fusion to produce a clear file.

Evaluation The obtained clear file was evaluated. The results were as follows. Peel strength: 2,350 g / 15 mm width Appearance: ○ Offset printability: Transferability ○, Adhesiveness ○

Example 3 In Example 1, the white sheet layer (A ¹ ) / propylene homopolymer layer (A) was used as the unstretched resin film support layer (A).
² ) / White sheet layer (A ¹ ) (Thickness 30μm / 340μm
(/ 30 μm) non-stretched laminated sheet, and as a file cover, a multi-layer synthetic paper B (thickness 90.1 μm) is thermally laminated on both sides of this non-stretched laminated sheet (thickness 580.2 μm). A clear file was obtained in the same manner as in Example 1 except that (1) was used. Peel strength: 2,280 g / 15 mm width Appearance: ○ Offset printability: Transferability ○, Adhesiveness ○

[0051]

In the clear file of the present invention, since the non-stretched film support layer of the resin containing the inorganic fine powder is formed in the layer forming the file cover, fusion by high frequency heating can be performed in a short time and further. Since the file cover can be prevented from being deformed due to heat shrinkage and the paper-like layer (B ² ) of the file cover contains the inorganic fine powder, it is possible to perform multicolor offset printing with vivid colors. ,
It can be a nice looking, versatile clear file.

[Brief description of drawings]

FIG. 1 is a perspective view of a clear file according to an embodiment of the present invention.

FIG. 2 is a sectional view of a central portion of a clear file according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 clear file 2 file cover 2a back part 2b, 2c hinge part 2d central part 3 laminated sheet 3a central part 4 bag 4a opening part 4b central part 5 voids 6 inorganic fine powder 7 heat fusion A non-stretching resin film Support layer B Multi-layer synthetic paper layer B ¹ Base material layer B ² Paper layer C Adhesive layer D Printing layer

Claims (3)

[Claims] 1. A non-stretched resin film support layer (A) having a wall thickness of 60 to 800 μm and containing an inorganic fine powder in a proportion of 8 to 55% by weight, wherein the inorganic fine powder is contained in an amount of 8 to 65.
The uniaxially stretched film of the thermoplastic resin contained in the weight% is used as the paper layer (B ² ), and the biaxially stretched resin film is used as the base layer.
(B ¹ ) The laminated synthetic paper (B) having a thickness of 30 to 300 μm is integrally attached so that the paper-like layer (B ² ) side forms the outer surface, and the thickness is 180 to 1,100 μm. Two hinge portions 2 parallel to the substantially central portion 3c of the laminated sheet 3 of FIG.
File cover 2 having b and 2c to form a back portion 2a
And a plurality of bags 4 made of a transparent thermoplastic resin film, which are laminated inside the file cover 2 and have an opening 4a formed above, and a central portion 4 of the bag 4.
b is integrally fused inside the back portion 2a of the file cover 2, and the print (D) is applied to the outer paper-like layer (B ² ) side of the file cover 2. A clear file featuring. 2. A non-stretched resin film support layer (A) containing a fine inorganic powder in a proportion of 8 to 55% by weight and having a thickness of 60 to 800 .mu.m.
The uniaxially stretched film of the thermoplastic resin contained in the weight% is used as the paper layer (B ² ), and the biaxially stretched resin film is used as the base layer.
The multi-layered synthetic paper (B) having a thickness of 30 to 300 μm formed as (B ¹ ) is integrally attached so that the paper-like layer (B ² ) forms an outer surface, and a thickness of 180 to 1 is obtained. , 100 μm of the laminate sheet 3, and then the paper-like layer of the laminate sheet 3
The printing (D) is applied to the (B ² ) side, two hinges 2b and 2c are provided in parallel with the substantially central portion 4b of the laminated sheet 3 to form the back portion 2a to form the file cover 2, and the file is formed. Inside the back portion 2a of the cover 2, a large number of bags 4 made of a transparent thermoplastic resin film having an opening 4a formed above are laminated, and a high frequency heating device is provided on the center portion 4b of the bag 4 and the back portion 2a. A method for manufacturing a clear file, characterized in that the die 10a of 10 is brought into contact with the back part 2a and a large number of bags 4 are integrally heat-sealed while being laminated. 3. High frequency fusion, current of 10 to 30 amps, voltage of 100 to 200 volts, power of 48 to 3,000.
The method for producing a clear file according to claim 2, which is obtained by carrying out under the conditions of W, frequency 10 to 20 kHz, amplitude 11 to 22, and application time 0.1 to 3 seconds.