JPH02283439A - Shielding laminating material and manufacture thereof - Google Patents

Abstract

PURPOSE:To enable a laminating material being easy in manufacturing and excellent in shielding to be obtained by comprising a shielding layer laminated in the order of a transparent synthetic resin extruding laminate layer, an adhesive agent layer and a mold releasing layer. CONSTITUTION:A shielding layer A laminated successively with a base material layer A1, an adhesive agent layer A2 and a metal foil layer A3 is constituted by being laminated in the order of a transparent synthetic resin extruding laminate layer B, an adhesive agent layer C and a mold releasing layer D. Besides, the base material layer A1 contains a pulp paper, coated paper, subpressed paper, super calendered paper, synthetic paper, non-woven fabric, laminated paper or the like, and another synthetic resin film or laminate thereof. Thus, there can be obtained a laminating material being easy in manufacturing and excellent in shielding.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a concealing laminated material, and more specifically to a concealing laminated material for protecting the secrets of correspondence and the like and preventing tampering. It is related to.

[Prior art and problems]

Traditionally, materials of this type include paper, adhesive, aluminum foil,
Labels in which a weak adhesive, a PET film, an adhesive, and a release paper are laminated in this order have been put into practical use.

However, since this label uses PET film, it is not only expensive, but also has a complicated manufacturing process because the PET film is laminated with aluminum foil via an adhesive.

[Failure to solve the problem]

In view of the above circumstances, the present inventors completed the present invention as a result of intensive research to solve the problem described in 1.

That is, the first aspect of the present invention is a base material layer (A1) and an adhesive layer (A1).
2) and a metal foil layer (A3) are sequentially provided on the concealing layer (A).
The second aspect of the present invention is a masking laminate material formed by laminating a transparent synthetic resin extrusion laminate layer (B), an adhesive layer (C), and a release layer (D) in this order. 80) and a metal foil layer (A3) are integrally bonded via an adhesive layer (A2).
), a transparent synthetic resin extrusion laminate layer (B) is formed by extrusion laminating a synthetic resin on the surface of the metal foil layer (A3), and an adhesive layer (C) and a release layer (D
) are sequentially laminated.

The present invention will be explained based on FIG. 1 showing an embodiment.
The hiding laminated material of the present invention comprises a base layer (A), an adhesive layer (
A concealing layer (A) formed by laminating A2) and a metal foil layer (A3) in order is a transparent synthetic resin extrusion laminate layer (B), an adhesive layer (C) and a release layer (D). It is composed of layers.

The base material layer (A1) in the present invention includes pulp paper, coated paper, size press paper, supercalendered paper, synthetic paper, nonwoven fabric, laminated paper, etc., as well as synthetic resin films and laminates thereof. It will be done. The selection of the base material is determined by the purpose and use of the base material. The thickness of the base layer (A1) is preferably in the range of 50 to 100 μm.

As the adhesive layer (A2) in the present invention, various adhesives such as glue-based adhesives, hot-melt adhesives, and solvent-based adhesives may be used, or an extruded laminate layer may be used.

As the metal foil in the present invention, aluminum foil is preferable, and its thickness is preferably 7 to 15 μm.

The base layer (A1) is laminated with a metal foil layer (A3) via an adhesive layer (A2) to form a concealing layer (A).

The concealing layer (A) thus obtained is laminated in sequence with a transparent synthetic resin extrusion laminate layer (B), an adhesive layer (C) and a release layer (D).

Transparent synthetic resin extrusion laminate layer (B) in the present invention
As the material, a synthetic resin having good mold releasability from the metal foil layer (A3) is used, and for example, polyolefins such as polyethylene and polypropylene, polyesters, etc. are suitable. The thickness of the transparent synthetic resin extrusion laminate layer (B) is 15
A range of ˜30 μm is suitable.

The adhesive force between the transparent synthetic resin extrusion laminate layer (B) and the metal foil layer (A, l) is the same as that of the adhesive layer (C) described later.
It is necessary that the adhesive force be smaller than the adhesive force between the adhesive and the synthetic resin extrusion laminate layer (B). Thus, the metal foil layer (A3
A preferred method is to coextrude and laminate a synthetic resin that has been adjusted to have ejaculatory adhesive strength by blending an adhesive force regulator on the surface of the resin and a synthetic resin that does not contain the regulator. As such an adhesive strength adjusting agent, an α-olefin adduct of polymethylhydrogensiloxane, silicone oil, polyethylene wax, polypropylene wax, etc. are used.

The adhesive layer (C) in the present invention is not particularly limited, and all pressure-sensitive and heat-sensitive adhesives such as rubber-based, acrylic-based, vinyl ether-based, and hot-melt adhesives can be used. (A3) and transparent synthetic resin extrusion laminate 2
- It is necessary that the adhesive force is greater than the adhesive force between the adhesive layer (B) and the adhesive layer (B).

The release layer (D) in the present invention is not particularly limited,
Silicone, polyethylene, polyvinyl chloride, ethylene-
Any mold release agent can be used, such as propylene copolymers. Further, as the base material, paper, cloth, synthetic resin film, etc. are used.

In the present invention, the thickness of the adhesive layer, the mold release agent, and the base material may be within normal ranges, and the adhesive layer has a solid content of 10 to 7.
Approximately 0g/n'f, mold release agent 1-100μ, base material 20
The thickness may be appropriately selected from the range of about 300 μm.

The hiding laminate material of the present invention having the above structure has a release layer (
D) is sent by pasting it on the surface of a printed matter that you want to hide, such as a postcard, and if the recipient wants to see the printed content, peel off the concealing layer (A), that is, the metal foil layer (A1).
and a transparent extruded synthetic resin laminate layer (B), and can be seen through the transparent extruded synthetic resin laminate layer (B) and the adhesive layer (C).

〔Example〕

Hereinafter, the present invention will be explained in more detail based on Examples, but the present invention is not limited thereto.

Example 1 Paper (woodfree paper, weight 66.3 g/e) as the base material (A1)
, aluminum foil (thickness 7 μm) was used as the metal foil layer (A3).
), the two were laminated by wet lamination using a glue adhesive (A2) and dried to produce a concealing layer (A).

Next, a transparent synthetic resin extrusion laminate layer (B) was laminated on the aluminum foil (A3) side of the concealing layer (A) by extrusion lamination using a coextrusion method.

At this time, the first extruder (screw diameter 40 mmφ) on the aluminum foil (A, l) side using the coextrusion method was equipped with low density polyethylene resin “Mirason M-16SPJ (MI-4
, 5d g/min, density 0.923g/cffl
97 parts by weight (manufactured by Mikata Petrochemical Industries) and 3 parts by weight of an α-olefin adduct of polymethylhydrogensiloxane (molecular weight 50,000, melting point 75°C) as an adhesive force regulator were mixed in advance using an extruder (screw diameter 40 mmφ; The kneaded pellets were fed into the second extruder (screw diameter: 32 mmφ) at an exit temperature of 190°C, and low-density polyethylene “Mirason M-16sp” was fed into the second extruder (screw diameter: 32 mmφ). Extruder side set temperature: 290°C, second extruder side set temperature: 290°C) to form a film (first extruder side - aluminum foil (A3) side 6 μm; second extruder side - 12 μm; total 18 μm). , coextrusion lamination was carried out.

Further, the surface of the transparent synthetic resin extrusion laminate layer (B) is coated with an adhesive (acrylic) to form an adhesive layer (C), and the surface of the adhesive layer (C) is coated with release paper (D). ) were laminated to obtain the concealing laminated material of the present invention.

Example 2 Using the same hiding layer (A) f as in Example 1, a transparent synthetic resin extrusion laminate layer (B) was laminated on the aluminum 9M (A3) surface of the hiding layer (A) by an extrusion lamination method.

At this time, low-density polyethylene resin "
Introducing Mirason M-16SPJ, the T-die outlet temperature was 32.
Lamination was carried out at 0°C to a thickness of 20 μm.

Further, the surface of the transparent synthetic resin extrusion laminate layer (B) is coated with an adhesive (rubber-based) to provide an adhesive layer (C),
Furthermore, a release paper (D) was laminated on the surface of the adhesive layer (C) to obtain a concealing laminated material of the present invention.

Example 3 Paper (high quality paper, weighing 6s, 3g/e) as the base material (A1)
, aluminum foil (thickness 7 μm) was used as the metal foil layer (A3).
) was laminated with a laminate adhesive layer (A2) interposed therebetween by an extrusion polysandramide lamination method to produce a concealing layer (A).

Extruded polysand laminate is made of low density polyethylene resin "Mirason M-16SPj" at T-die exit temperature of 340°C.
paper (A1) and aluminum foil (A3).
) to a thickness of 20 μm.

Next, the aluminum foil (A1) of the obtained hiding layer (A)
A transparent synthetic resin extrusion laminate layer (B) was laminated onto the surface of the substrate by extrusion lamination using a coextrusion method.

At this time, low-density polyethylene resin [Mirason M-16SPJ] was introduced into the first extruder (screw diameter 40 mmφ) and the second extruder (screw diameter 32 mmφ) on the aluminum 7g (Ai) side using the coextrusion method, and the coextrusion Formed into a film (first extruder side - aluminum foil (A3) side 7 μm; second extruder side −
14 μm; total 21 μm), and coextrusion lamination was performed.

Further, the surface of the transparent synthetic resin laminate layer (B) is coated with an adhesive (acrylic) to provide an adhesive layer (C),
Furthermore, a release paper (D) is laminated on the surface of the adhesive layer (C),
A concealable laminated material of the present invention was obtained.

The hiding adhesive laminate materials of the present invention obtained in Examples 1 to 3 were tested by the following method. The results are shown in Table 1.

(1) l! i-hiding test: After peeling off the release paper (D) from the hiding laminated material and pasting it on a printed postcard, it is viewed under light. If the printed content cannot be read (there is concealment), it is judged as good, and if it is legible, it is judged as poor.

(2) Peeling test: After conducting the hiding property test, scratch the edge of the hiding laminate material with your fingernail, and if the mask of the hiding layer (A) peels off (aluminum F & (Ai) and transparent synthetic resin extruded laminate layer ( B)
If the layer peels off between the two layers, it is judged as good, and if it peels off between the other layers, it is judged as poor. Furthermore, for those determined to be good, adhesive strength is measured.

Next, the adhesive force between the transparent synthetic resin extrusion laminate layer (B) and the adhesive layer (C) is measured.

Measurement conditions: sample width 25 mm, 180° peeling, tensile speed 3
00 loads/min (3) Visual confirmation test After conducting the peel test, those judged to be good are considered good if the printed content can be clearly read through the transparent synthetic resin extrusion laminate layer (B) and adhesive layer (C). In addition, if the printed content is illegible or difficult to read, it is determined to be unacceptable.

Table 1 *Adhesion Crab n-3, R value in parentheses [Function/Effect] As mentioned above, the present invention can provide a laminated material that is easy to manufacture and has good hiding properties.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention. A...Base material layer A2...Adhesive layer A3...Metal foil layer A...Hidden layer B...Transparent synthetic resin extrusion laminate layer C...Adhesive layer D...Release layer Pattern layer patent applicant Goyoshi Kogyo Co., Ltd.

Claims (1)

[Claims] 1. The concealing layer (A), which includes a base material layer (A_1), an adhesive layer (A_2), and a metal foil layer (A_3), is a transparent synthetic resin extrusion laminate layer (B). ), an adhesive layer (C), and a release layer (D) are laminated in this order. 2. The material according to claim 1, wherein the adhesive layer (A_2) is an extruded laminate layer. 3. Connect the base material layer (A_1) and metal foil layer (A_3) with an adhesive layer (
A transparent synthetic resin extrusion laminate layer (
B), and further laminated an adhesive layer (C) and a release layer (D) in this order. 4. The manufacturing method according to claim 3, wherein the adhesive layer (A_2) is an extrusion laminate layer. 5. The transparent synthetic resin extrusion laminate layer (B) is created by co-extrusion laminating a synthetic resin containing an adhesive force regulator and a synthetic resin not containing an adhesive force regulator on the surface of the metal foil layer (A_3). 4. The manufacturing method according to claim 3, wherein: