JPH0631855A - Pressure-sensitively sealable packaging material - Google Patents

Abstract

PURPOSE:To make readhesion after peeling once impossible at ordinary temp. and to make it possible to confirm peeling even if readhesio is done by making an adhesive force between a base material and an aluminum-deposited layer weaker than an adhe sive force between the aluminum-deposited layer and an pressure-sensitive adhesive layer and an adhesive force between the pressure-sensitive adhesive layer and another pressure-sensitive adhesive layer. CONSTITUTION:At least an aluminum-deposited layer 2 and a pressure-sensitive adhesive layer 30 are successively laminated on the inner face side of a base material 10 such as a resin film. In this case, an adhesive force between the base material 10 and the aluminum-deposited layer 20 is made weaker than both an adhesive force between the aluminum-deposited layer 20 and a pressure-sensitive adhesive 30 and an adhesive force between pressure-sensitive adhesive layers 30 each other. As a result, when the base material 10 such as the resin film and the aluminum-deposited layer 20 are peeled off once, the adhesive force between them is lost and resealing as they are at ordinary temp. becomes impossible. In addition, even if the pressure-sensitive adhesive layers 30 are press-bonded again together, as the interlayer between the peeled aluminum-deposited layer 20 and the surrounding is destroyed, it can be easily confirmed that the base material 10 and the aluminum-deposited layer 20 has been opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive sealable packaging material suitable for packaging confectionery or the like that is easily melted by heat, which can be easily confirmed to be opened.

[0002]

2. Description of the Related Art Conventionally, for packaging bags such as ice cream, chocolate, and sugar confectionery which are easily melted by heat, a heat-fusible packaging material such as a resin film is used. A packaging bag such as a three-sided seal bag or a gastric seal bag, which is heat-sealed and sealed at a certain distance (with a little waste of the heat-fusible packaging material), is widely used.

Conventionally, a pressure-sensitive sealable packaging material (commonly referred to as a cold seal packaging material), which is laminated with a pressure-sensitive adhesive layer and can be pressed and sealed at room temperature, is used, and confectionery easily melted by the heat. In which, a three-sided seal bag, a gastric seal bag, or the like is used, and in, for example, Japanese Utility Model Publication No. Sho 60-3025, excellent light blocking properties, gas blocking properties, design properties, etc., The invention of a pressure-sensitive sealing packaging material in which a vapor-deposited aluminum layer is laminated is disclosed.

[0004]

However, regarding a three-sided seal bag or a gastric seal bag using the above-mentioned pressure-sensitive sealing packaging material (cold seal packaging material), the parts where the pressure-sensitive adhesive layers are laminated are separated from each other. Since it can be sealed simply by stacking and mechanically pressing it at room temperature, it is a packaging material suitable for packaging sweets that are easily melted by heat, such as ice cream, chocolate, sugar confectionery, but pressure sensitive adhesive layers It is a problem that, when the pressure-bonded part is peeled off and opened, the pressure-sensitive adhesive layer has a constant adhesive force, so that the pressure-sensitive adhesive layer can be pressure-bonded and resealed as it is. A third party other than the manufacturer or consumer could open the box and insert foreign objects (mischief) or replace confectionery (counterfeit).

In order to prevent these mischief and forgery, the pressure-sensitive sealing material is a pressure-sensitive sealing material in which it is possible to easily confirm that the pressure-sensitive adhesive layer has been opened by peeling off the pressure-bonded portions. Therefore, there is a demand for a pressure-sensitive sealing material that cannot be easily crimped and resealed.

[0006]

[Means for Solving the Problems] In view of the above-mentioned demand for a pressure-sensitive sealing packaging material (cold seal packaging material),
The present invention, as shown in FIG. 1, is a substrate such as a resin film.
On the inner surface side of (10) is a pressure-sensitive sealing packaging material in which at least an aluminum vapor deposition layer (20) and a pressure-sensitive adhesive layer (30) are sequentially laminated, and this base material (10) and an aluminum vapor deposition layer ( Adhesive strength with 20), aluminum vapor deposition layer (20) and the pressure-sensitive adhesive (30) and the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30), (EN) A pressure-sensitive sealing packaging material that can be easily confirmed to be opened by being weaker than any of the adhesive strengths, and is a pressure-sensitive sealing packaging material that cannot be easily crimped and resealed.

Regarding the substrate (10) such as a resin film of the present invention, a transparent resin film for ordinary packaging materials such as polyethylene (PE), polypropylene (PP) or polyester (PET), or a laminated product thereof, etc. Can be used without any restrictions.

At least the aluminum vapor-deposited layer (20) and the pressure-sensitive adhesive layer are provided on the inner surface side of the substrate (10) such as a resin film of the present invention.
Regarding the method of laminating (30) in order, it is the same as the conventional pressure-sensitive sealing packaging material (cold seal packaging material), and in a normal vacuum vapor deposition step, the substrate (10) and the aluminum vapor deposition layer described later are used. (2
While controlling the adhesive strength with (0), after laminating (vapor-depositing) a 300-600 Å aluminum vapor-deposited layer (20) on the inner surface side (content side such as confectionery) of the above-mentioned base material (10), In the gravure printing process, etc., at the same time as printing the printed pattern layer (12) on the outer surface side of the substrate (10), mechanically applying the aluminum deposition layer (20) on the inner surface side of the substrate (10) at room temperature. An appropriate pressure-sensitive adhesive layer (30) having a layer thickness of 3 to 6 μm is laminated (printed) on the portion to be pressed.

In this case, if necessary, contents such as confectionery should not be in direct contact with the aluminum vapor deposition layer (20), and the pressure-sensitive adhesive layer (30) should not affect the aluminum vapor deposition layer (20). So that the aluminum vapor deposition layer (2
It is preferable to coat or print the aluminum vapor deposition protective layer (21) on the inner surface side of (0) and then laminate (print) the pressure-sensitive adhesive layer (30) described above.

Regarding the adhesive strength between the base material (10) such as a resin film and the aluminum vapor-deposited layer (20) of the present invention, the contents such as confectionery are packed in a three-sided seal bag or a pouch seal bag. In addition, in order to prevent the base material (10) and the aluminum vapor deposition layer (20) from being easily peeled off (the function as a packaging material cannot be achieved), the portion where the pressure-sensitive adhesive layers (30) are pressure-bonded to each other is also required. Adhesive strength between the base material (10) such as a resin film and the aluminum vapor deposition layer (20) in order to surely separate the base material (10) and the aluminum vapor deposition layer (20) when peeled and opened. 60-120g / 15mm (15m
An aluminum vapor-deposited layer (20) of 300 to 600 Å is laminated (vapor-deposited) on the inner surface side of the base material (10) while controlling it by cutting it into strips of m width and measuring the same.

In general, regarding the adhesive strength between the aluminum vapor-deposited layer (20) and the substrate (10) such as a resin film for ordinary packaging materials such as polyethylene (PE), polypropylene (PP) and polyester (PET), The adhesive strength of 20 to 500 g / 15 mm is obtained, and the type of the substrate (10) such as a resin film and the vacuum degree in the vacuum deposition process (the adhesive strength decreases if the vacuum degree decreases) It is decided by. That is, in the case of a base material (10) such as a resin film having a relatively weak adhesion to the aluminum vapor deposition layer (20), a medium degree of vacuum (10 ^-4 Torr
Vacuum deposition with a degree (depending on the degree and model), and in the case of a substrate (10) such as a resin film having a relatively strong adhesive force with the aluminum deposition layer (20), a low degree of vacuum (10 ^-2 Torr degree,
Vacuum deposition with different types), and the adhesive force between the base material (10) such as a resin film and the aluminum vapor deposition layer (20) is 60-
It can be controlled to 120g / 15mm.

Further, a substrate (1) such as a resin film of the present invention
Regarding the adhesive force between the aluminum vapor deposition layer (20) and the aluminum vapor deposition layer (20), as shown in FIG. 2, the adhesive force adjusting varnish layer (11) is formed on the inner surface side of the base material (10).
By using the base material (10) coated with (printing), while controlling the adhesive force between the adhesive force adjusting varnish layer (11) and the aluminum vapor deposition layer (20) to 60 to 120 g / 15 mm, Wood (10)
300 ~ 600Å on the adhesive strength control varnish layer (11) on the inner surface of
The aluminum vapor deposition layer (20) is laminated (vapor deposited).

That is, the above-mentioned medium degree of vacuum (10
Adhesive strength between the base material (10) and the aluminum vapor deposition layer (20) varies due to vacuum deposition with a vacuum degree of about ^-4 Torr) or a low degree of vacuum (about 10 ^-2 Torr) (may vary depending on model). in case of,
Further, the adhesive force between the aluminum vapor deposition layer (20) and the pressure-sensitive adhesive (30) described below and the adhesive force between the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30), and the base material (10). When the adhesive force between the aluminum vapor deposition layer (20) and the aluminum vapor-deposited layer (20) is close (the difference in adhesive force is within 60 g / 15 mm), the base material other than the portion where the pressure-sensitive adhesive layers (30) are pressure-bonded to each other. (Ten)
If you want to increase the adhesion between the aluminum vapor deposition layer (20) and the aluminum vapor deposition layer (20) (light blocking property, gas blocking property, designability, etc.), use the normal gravure printing process, etc. to print on the outer surface of the base material (10). Layer (1
At the same time as printing 2), etc., an appropriate adhesive such as nitrified cotton, chlorinated rubber, acrylic, etc. is applied to the part where the pressure-sensitive adhesive layer (30) on the inner surface side of the substrate (10) is laminated (printed). Force adjustment varnish layer (1
By applying (printing) 1) in the form of a solid or a thin line (dots), the degree of vacuum (10 ⁻⁶ T
(orr) vacuum deposition is possible, and the adhesive strength between the adhesive force adjusting varnish layer (11) and the aluminum vapor deposition layer (20) on the inner surface side of the base material (10) is stable at 60 to 120 g / 15 mm. Can be controlled by

Regarding the adhesive force between the aluminum vapor deposition layer (20) and the pressure-sensitive adhesive layer (30) of the present invention, as described above,
Aluminum vapor deposition layer (20, or aluminum vapor deposition protection layer (2
When a suitable pressure-sensitive adhesive layer (30) having a layer thickness of 3 to 6 μm is laminated (printed) on a portion of the aluminum vapor deposition layer (1) coated with aluminum) which is mechanically pressed at room temperature, 150 to 400 g / 15 mm The adhesive strength of the pressure-sensitive adhesive is obtained easily and stably depending on the type of the pressure-sensitive adhesive and the layer thickness of the pressure-sensitive adhesive layer (30) (the thicker the layer, the stronger the adhesive strength). It is possible to obtain an adhesive force of 180 g / 15 mm or more.

Regarding the adhesive strength between the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30) of the present invention, confectionery which is easily melted by heat is packed in a three-sided seal bag or a pouch. Adhesive force for removing the layer thickness of 3 to 6 in the same manner as described above.
When an appropriate pressure-sensitive adhesive layer (30) having a thickness of μm is laminated (printed), an adhesive force of 200 to 400 g / 15 mm can be easily and stably obtained.

[0016]

[Function] According to the present invention, the adhesive force between the substrate (10) such as a resin film and the aluminum vapor deposition layer (20) is the same as the adhesive force between the aluminum vapor deposition layer (20) and the pressure-sensitive adhesive layer (30). Which of the adhesive force between the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30) (180 g / 15 mm
For more weakness than the above), the pressure-sensitive adhesive layer (30) of the pressure-sensitive sealable packaging material in which contents such as confectionery are wrapped in a three-sided seal bag or a gastric seal bag is crimped. In order to surely peel off the base material (10) and the aluminum vapor deposition layer (20) when peeled and opened, the adhesive force between the base material (10) and the aluminum vapor deposition layer (20) is 60 to 120 g. It is controlled to / 15mm.

That is, when the base material (10) such as a resin film and the aluminum vapor deposition layer (20) of the pressure-sensitive hermetically-sealed packaging material of the present invention are once separated, the base material (10) and aluminum Since the adhesive strength with the vapor deposition layer (20) is lost, it cannot be resealed even if it is pressure-bonded at room temperature as it is, and if the pressure-sensitive adhesive layers (30) are re-pressure bonded (bonded) by some means. ),
It can be easily confirmed that the interlayer and the periphery of the peeled aluminum vapor deposition layer (20) are broken and that the base material (10) and the aluminum vapor deposition layer (20) are opened (peeled).

[0018]

【Example】

<Example 1> FIG. 1 is a partial cross-sectional view showing a laminated state of a pressure-sensitive sealing packaging material in Example 1 of the present invention. That is, on the inner surface side of a base material (10) of a biaxially stretched polypropylene film (Sun Orient MB-110, manufactured by Yuka Sansho Co., Ltd.) having a thickness of 30 μm whose outer surface side is corona-treated, a normal vacuum deposition step ( EPS-10A type, manufactured by Nippon Vacuum Technology Co., Ltd., 3.0 x 1
After vapor deposition (lamination) of an aluminum vapor deposition layer (20) with an average of 400 Å at a low vacuum degree of 0 ^-2 Torr, a print pattern layer (12) on the outer surface side of the substrate (10) is subjected to a normal gravure printing process. And a peelable varnish layer (13, which prevents blocking (adhesion) between the pressure-sensitive adhesive layer (30) and the substrate (10) or the printed pattern layer (12) when wound), at the same time as the base material. The average layer thickness of 4 μm (3.5 g / 3.5 g / mm) on the part of the aluminum vapor deposition layer (20) on the inner surface of the material (10) that is mechanically pressed at room temperature.
m ² , dry) pressure-sensitive adhesive (Dickseal CS-502, manufactured by Dainippon Ink and Chemicals, Inc.) layer (30) printed (laminated) showing the laminated state of the pressure-sensitive sealing material Is.

Next, the pressure-sensitive sealable packaging material of the present embodiment,
The pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (3) on the inner surface side of the substrate (10)
(0) is superposed on the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30) are peeled from each other after they are bonded together by applying a pressure of 7.0 kg / cm ^{2 at} room temperature. The substrate (10) and aluminum vapor deposition layer
There is peeling between (20) and the peeled portion is 7.0 kg / c
It could not be re-adhered even if a pressure of m ² or more was applied, and the aluminum vapor-deposited layer of the pressure-sensitive adhesive layer (30) that was adhered by applying pressure.
The interlayer and the periphery of (20) are destroyed, and the aluminum vapor deposition layer (2
The gloss of 0) disappeared and wrinkles occurred.

The pressure-sensitive sealing material of this embodiment is 1
The adhesive force between the base material (10) and the aluminum vapor-deposited layer (20) was 108 g / 15 mm (measured 10 times) when the adhesive force was measured at a peeling speed of 300 mm / min. Average value, the same below), the adhesive strength between the aluminum vapor deposition layer (20) and the pressure sensitive adhesive layer (30) is 350 g / 15 mm, and the pressure sensitive adhesive layer (30) and the pressure sensitive adhesive are The adhesive strength with the layer (30) was 205 g / 15 mm.

<Embodiment 2> FIG. 2 is a partial cross-sectional view showing a laminated state of the pressure-sensitive sealing packaging material in Embodiment 2 of the present invention. That is, using the same corona-treated base material (10) of biaxially oriented polypropylene film having a thickness of 30 μm as in Example 1, first, in a normal gravure printing process, the outer surface side of the base material (10) was used. At the same time as the printing of the printed pattern layer (12) and the peelable varnish layer (13), 0.8 g is applied to the portion where the pressure-sensitive adhesive layer (30) on the inner surface side of the base material (10) is laminated (printed). / cm ² (dry) adhesion control varnish (BCX reducer, Dainippon Ink & Chemicals Co., Ltd.) layer (11) is printed (applied) in the form of a thin line, and then a normal vacuum deposition process (EPS) is performed. -10A type, Japanese vacuum technology
Co., Ltd.) to vapor-deposit (laminate) an aluminum vapor-deposited layer (20) of 400 Å on average at a vacuum degree of 8.0 × 10 ^-5 Torr, and then, in a normal gravure printing process, an aluminum vapor-deposited layer While printing a normal aluminum vapor deposition protection varnish (21) on the entire surface of (20),
As in Example 1, the aluminum vapor deposition layer (2
The average layer thickness of 4 μm (3.
5g / m ² , dry) Pressure-sensitive adhesive (Dickseal CS-502, manufactured by Dainippon Ink and Chemicals, Inc.) Layer (30) is printed (laminated) to show the laminated state of the pressure-sensitive sealing packaging material. It is a thing.

Next, as in Example 1, the pressure-sensitive adhesive layer (3) on the inner surface side of the substrate (10) of the pressure-sensitive sealing packaging material of this Example was used.
0) and pressure-sensitive adhesive layer (30) are overlaid, and at room temperature 7.0 kg / c
After the pressure-sensitive adhesive layer (30) and the pressure-sensitive adhesive layer (30) which were adhered to each other were peeled off after applying pressure of m ² to adhere the substrate,
There was peeling between (10) and aluminum vapor-deposited layer (20), and the peeled portion could not be re-adhered even if pressure of 7.0 kg / cm ² or more was applied. The aluminum vapor-deposited layer (20) in the adhered pressure-sensitive adhesive layer (30) was destroyed like the adhesive force adjusting varnish layer (11) printed in a fine line shape.

The pressure-sensitive hermetically-sealed packaging material of this embodiment is
As in Example 1, it was cut into 15 mm wide strips, and the adhesive force was measured at a peeling speed of 300 mm / min.
The adhesive force between the fine line-shaped adhesive force adjusting varnish layer (11) on the inner surface side of the base material (10) and the aluminum vapor deposition layer (20) is 96 g / 15 mm (average value of 10 measurements, the same applies below), The adhesive force between the aluminum vapor deposition layer (20) and the pressure sensitive adhesive layer (30) is 350 g / 15 mm, and the adhesive force between the pressure sensitive adhesive layer (30) and the pressure sensitive adhesive layer (30) is 205 g. /
The adhesive strength between the base material (10) on which the adhesive strength adjusting varnish layer (11) was not printed was 15 mm and the aluminum vapor deposition layer (20) was 287.
It was g / 15 mm.

[0024]

As described above, in the pressure-sensitive sealing packaging material of the present invention, the adhesive force between the base material such as the resin film and the aluminum vapor-deposited layer is pressure-sensitive adhesive with the aluminum vapor-deposited layer. The adhesive force between the adhesive layer and the pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer are weaker than either of the adhesive forces, so that the contents such as confectionery can be stored in a three-sided seal bag or a gastric seal bag. The base material and the aluminum vapor deposition layer can be reliably peeled off when the portion of the packaged pressure-sensitive hermetically sealed packaging material where the pressure-sensitive adhesive layers are pressure-bonded to each other is peeled off and opened.

That is, when the base material such as the resin film and the aluminum vapor deposition layer of the pressure-sensitive sealing packaging material of the present invention are once peeled off, the adhesive force between the base material and the aluminum vapor deposition layer is lost. Then, it cannot be re-bonded even if it is pressure-bonded at room temperature as it is, and even if it is re-pressure-bonded (bonded) by some means, the layer and the periphery of the peeled aluminum vapor deposition layer are destroyed, and this It can be easily confirmed that the base material and the aluminum vapor deposition layer are opened (peeled).

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a laminated state of a pressure-sensitive sealing packaging material in Example 1 of the present invention.

FIG. 2 is a partial cross-sectional view showing a laminated state of the pressure-sensitive sealing packaging material in Example 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Base material 11 ... Adhesive force adjustment varnish layer 12 ... Printed pattern layer 13 ... Peelable varnish layer 20 ... Aluminum vapor deposition layer 21 ... Aluminum vapor deposition protection layer, Aluminum vapor deposition protection varnish 30 ... Pressure sensitive adhesive layer

Claims (2)

[Claims] 1. A pressure-sensitive sealable packaging material in which at least an aluminum vapor-deposition layer and a pressure-sensitive adhesive layer are laminated in this order on the inner surface side of a base material such as a resin film. Pressure-sensitive sealing characterized in that the adhesive force is weaker than either the adhesive force between the aluminum vapor deposition layer and the pressure-sensitive adhesive layer or between the pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer. Packaging material. 2. The pressure-sensitive sealing packaging material according to claim 1, wherein the base material such as the resin film is a base material having an adhesive force adjusting varnish layer coated on the inner surface side.