JP2007090837A - Paper laminate material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper laminate material exhibiting metallic gloss in appearance and excellent designability and having a stable vapor-deposition layer which allows the material applicable in the area of application requiring water vapor- and oxygen-barrier abilities particularly in the area of food packaging materials. <P>SOLUTION: The paper laminate is obtained by applying an anchor coating agent on a paper substrate, to form a anchor coat-coated layer or an anchor coat-impregnated layer and depositing layer coated with or impregnated with the anchor coating agent, and laminating a metal vapor-deposition layer on the above coated layer or impregnated layer. The anchor coating agent is applied on the substrate in an amount of ≥0.2 g/m<SP>2</SP>by dry weight per 1 μm of the substrate thickness. The glossiness of the metal vapor-deposition layer is ≥70% at an incidence angle of 60° and a reflection angle of 60°. The water vapor permeability is ≤3 g/m<SP>2</SP>/day. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper laminate material that can be used as a food packaging material and has a stable vapor deposition layer, particularly for applications requiring water vapor barrier properties.

  Conventionally, an aluminum foil having excellent gas barrier properties and light shielding properties laminated with a plastic film has been used as a packaging material.

  However, there are two methods for disposing of plastic films laminated with aluminum foil: the incineration method and the landfill method, but in the case of incineration, the aluminum foil remains without burning, and in the case of landfill it is permanently in the ground. It remains a cause of environmental problems, and in recent years, it has become desirable to remove aluminum foil.

  In recent years, laminate materials using paper have been attracting attention and research has been attempted in the field of packaging materials.

  For example, a packaging material for confectionery has been proposed in which a polyethylene film is interposed between an outer paper and a polyethylene terephthalate film having a silicon vapor deposition layer formed on one side, and a polyethylene film layer is formed on the silicon vapor deposition surface of the polyethylene terephthalate film layer. (See Patent Document 1).

However, this wrapping material for confectionery is a combination of an outer paper and a polyethylene terephthalate film imparted with a gas barrier property by silicon vapor deposition, and is not a paper laminate material in which a gas barrier property can be obtained with a single paper with less environmental impact. No paper laminate material has been known that has a gas barrier property with a single paper that has little environmental impact.
JP 2002-11822 A

  In view of the above-mentioned points, the object of the present invention is to have an excellent appearance with a metallic luster, can be used as a food packaging material, particularly for applications requiring water vapor barrier properties, and The object is to provide a paper laminate having a stable vapor deposition layer.

The paper laminate of the present invention that achieves the above-described object has the following configuration (1).
(1) An anchor coat agent is applied on a base material layer that is paper to form an anchor coat layer or an anchor coat impregnated layer, and a metal vapor deposition layer is laminated on the anchor coat layer or the anchor coat impregnated layer. Incident angle after laminating the metal vapor deposition layer, which is a paper laminate material, and the anchor coating agent is applied in an amount of 0.2 g / m ² or more by weight after drying with respect to the thickness of the substrate layer of 1 μm. A paper laminate having a glossiness of 70% or more and a water vapor transmission rate of 3 g / m ² / day or less under the condition of 60 ° × reflection angle 60 °.

In addition, the paper laminate of the present invention preferably has the following configurations (2) to (3).
(2) The paper laminated material according to the above (1), wherein the maximum height of the surface roughness on the coated surface of the anchor coat layer is 11 μm or less.
(3) The paper laminated material according to any one of (1) and (2), wherein the metal forming the vapor deposition layer is metallic aluminum.

  The paper laminate of the present invention has a good design with a metallic luster in appearance, water vapor barrier properties, and excellent light shielding properties.

  In addition, the paper laminate material of the present invention has good printability by using paper for the base material layer, and has the same foldability and twistability as a component using an aluminum foil. It can be used favorably as a packaging material for cigarettes, pharmaceutical packaging materials, or precision electronic components.

  The paper laminate of the present invention is a laminate that can be incinerated because the main part is paper.

In the paper laminate of the present invention, an anchor coat agent is applied to a base material layer made of paper to form an anchor coat layer or an anchor coat impregnated layer, and the anchor coat layer or the anchor coat impregnated layer is further formed. It is a paper laminated material in which a metal vapor deposition layer is laminated. The anchor coating agent is applied to the base material layer, which is paper, to some extent, so if the base material layer is thick, the coating amount should be proportionally increased. In addition, it is important that the anchor coating agent is applied in an amount of 0.2 g / m ² or more in terms of the weight after drying per 1 μm of the thickness of the base material layer. That is, if the thickness of the base material layer is 10 μm, which is 10 times, the anchor coating agent needs to be applied at ² g / m ² or more which is 10 times the weight after drying.

Further, the paper laminate of the present invention has a glossiness of 70% or more under the condition of an incident angle of 60 ° × reflection angle of 60 ° after the metal vapor deposition layer is laminated, and a water vapor transmission rate of 3 g / m ² / It is not more than day.

  In the present invention, the paper constituting the base material layer refers to paper defined by JIS-P0001, which is produced by attaching vegetable fibers and other fibers (glue). In addition to synthetic paper produced using a synthetic polymer substance, the concept includes paper blended with a fibrous inorganic material.

  Regarding the paper forming the base material layer, from the viewpoint of the so-called paper type, examples of paper preferably used in the present invention include gravure paper, kraft paper, carbon paper, glassine paper, art paper, white interleaf paper. Various papers such as glossy paper and paraffin paper can be used. Among them, white paper that is inexpensive in price is preferable.

  An anchor coat agent is an agent that can form an anchor coat layer on a base material layer and has an effect of imparting surface smoothness and barrier properties. For example, as a primer agent for vapor deposition What is marketed can be used.

In the present invention, as described above, the amount of the anchor coating agent applied is proportionally proportional to the thickness of the base material layer because the base material layer of paper sucks the anchor cord agent to some extent. Thus, the anchor coating agent is applied in an amount of 0.2 g / m ² or more by weight after drying per 1 μm of the thickness of the base material layer. According to the knowledge of the present inventors, the upper limit of the coating amount is that an effect commensurate with the coating amount can no longer be seen. Therefore, after the anchor coat agent is dried per 1 μm of the thickness of the base material layer, The weight is about 1.0 g / m ² .

  The maximum height of the surface roughness of the coated surface after application and drying of the anchor coating agent is preferably 11 μm or less. In particular, considering the water vapor transmission rate after vapor deposition, the maximum height of the surface roughness after application of the anchor coating agent and drying is more preferably 9 μm or less. The lower limit of the maximum height of the surface roughness is up to about 3.0 μm from the viewpoint of processing.

  The glossiness of the surface after application of the anchor coating agent (incident angle 60 ° × reflection angle 60 ° condition) is desirably 13% or more. In particular, when considering the water vapor transmission rate after vapor deposition, the glossiness of the surface after application of the anchor coating agent (incident angle 60 ° × reflection angle 60 °) is more preferably 16% or more.

  The anchor coating agent is applied on a base material layer that is paper. After application, the anchor coat agent may form a layer as an anchor coat layer on the base material layer, the anchor coat may be completely impregnated into the base material layer, and a part of the anchor coat is anchored. A coat layer may be formed and part of the substrate layer may be impregnated. In any case, according to the knowledge of the present inventors, the effect of using the anchor coat agent is sufficiently recognized. .

  The property of the polymer used as the anchor coating agent is an agent having an improving effect on the above-mentioned gas barrier properties, surface roughness after drying, and glossiness (incident angle 60 ° × reflection angle 60 °), Any material can be used as long as it can be effectively applied to the constituent fibers of the paper, and it can be impregnated between the fibers, and is not particularly limited.

  As the polymer used as the anchor coating agent, for example, an acrylic, polyester, polyurethane, wax, or polybutyl alcohol-based coating agent is preferable, and the water vapor transmission rate after vapor deposition of the paper laminate of the present invention is increased. When considered, polyurethane systems are particularly preferred.

  In applying the anchor coating agent, the number of times of coating (number of times of coating) is not particularly limited, but is preferably about 1 to 3 times from the viewpoint of cost.

  When applying the anchor coating agent on the base material layer, which is paper, the drying temperature and drying time of the anchor coating agent are not particularly limited. The time is preferably such that the moisture content after drying after application of the anchor coat is 3% or less, more preferably 2% or less. A preferable lower limit of the moisture content after drying is 0%.

  The anchor coating agent can be appropriately applied by a conventionally known method such as a gravure method, a comma method, an air knife method, or a reverse roll method. Even a hand coat using a bar coater is essentially the same.

In the paper laminated material of the present invention, as described above, the anchor coat agent is applied in an amount of 0.2 g / m ² or more in terms of the weight after drying the anchor coat agent per 1 μm of the base layer thickness. The amount of the anchor coating agent applied is preferably 0.4 g / m ² or more by weight after drying with respect to 1 μm of the base layer thickness.

In the paper laminate of the present invention, when the thickness of the base material layer is 1 μm, the coating amount after drying of the anchor coating agent (coating amount per area) is the coating amount per area converted based on the base material layer thickness. It is defined by the converted value of (weight). When 0.2 g / m ^{2 is} applied as the weight after drying with respect to 1 μm of the thickness of the base material layer, the weight of the anchor coating agent (after drying) when converted to 1 μm thickness is 0.2 g / m. is to be applied to be ^2, for example, when the substrate layer is 10μm thickness, the thickness is 10 times, 10 times the anchor coating agent in weight after drying 2 g / m ² It means to be applied.

  In the paper laminate of the present invention, the anchor coating agent not only has an effect of imparting water vapor permeability after vapor deposition, but also prevents moisture absorption of the base material layer and prevents wrinkles due to moisture absorption of the paper and cracks of the vapor deposition layer due to the wrinkles. It also provides an effect as a protective layer.

  In the paper laminate of the present invention, an anchor coating agent is applied on a base material layer that is paper, and a metal vapor deposition layer is further laminated on an anchor coat application surface.

  Examples of the metal vapor-deposited layer include aluminum, tin, zinc, copper, magnesium, copper and oxides thereof, and silicon oxide vapor-deposited layers such as silica. From the viewpoint of vapor deposition appearance and food hygiene, metal aluminum, A metal vapor deposition method formed from alumina or silica is preferred.

The method of laminating the metal vapor deposition layer is preferably a vacuum vapor deposition method.
Vacuum deposition can be performed by conventional methods such as heat deposition, sputtering, and ion plating. Industrially, the vacuum winding is preferably a continuous winding type, but may be a single wafer type.

  The paper laminate according to the present invention has a glossiness of 70% or more, more preferably 100% or more under conditions of an incident angle of 60 ° × reflection angle of 60 ° after the metal vapor deposition layer is laminated. . When the glossiness is less than 70%, the gas barrier property is insufficient, and when used as a food packaging material, it is not preferable because the outside air permeates the food inside.

In the paper laminate according to the present invention, it is important that the water vapor transmission rate after laminating the metal vapor deposition layer is 3 g / m ² / day or less, and further 2 g / m ² / day or less. Preferably there is. Such water vapor permeability is low, but in which metal deposition is meant that it is ideally performed, 3g / m ² / day it less and less, more preferably, 2 g / m ² / The fact that it is as small as day or less is particularly excellent in that the permeation of gas can be blocked and the freshness of food in the packaging material can be kept long as a packaging material for food.
In the paper laminated material of the present invention, the lower limit value of the preferable range of the water vapor transmission rate can be up to about 0.5 g / m ² / day with the paper laminated material of the present invention that is well prepared. Realization of about 0 g / m ² / day is also possible by properly configuring the metal vapor deposition layer.

  In the paper laminated material of the present invention, the thickness of the vapor-deposited layer is not particularly limited, but is preferably a thickness that satisfies a surface resistance value of 3Ω or less. More preferably, the thickness satisfies the above. This is because there is a correlation of the thickness of the metal vapor deposition layer between the surface resistance value and the metal vapor deposition layer.

In the paper laminate of the present invention, a paper laminate satisfying a glossiness of 70% or more and a water vapor transmission rate of 3 g / m ² / day or less under the condition of an incident angle of 60 ° × reflection angle of 60 ° after the metal vapor deposition layer is laminated. In order to obtain a material, an anchor coat agent is applied so that the maximum height of the surface roughness is 11 μm or less and the glossiness of the surface (incident angle 60 ° × reflection angle 60 °) is 13% or more, and the surface resistance is increased. It is important to control the value to 3Ω or less to form a metal vapor deposition layer.

The paper laminates of the present invention will be specifically described by the following examples, but the present invention is not limited to these examples.
(1) Maximum height (μm):
Using a universal surface shape measuring machine (SE-3C, manufactured by Kosaka Laboratory Co., Ltd.) according to JIS B0601, the paper wound up in a 3-inch paper tube is 20 cm × 10 in an atmosphere of 23 ° C. and 63% RH. Cut into centimeters and measured at n number of 5 points.
(2) Glossiness:
The paper wound on a 3-inch paper tube is cut to A-4 size in an atmosphere of 23 ° C. and 63% RH, and a digital variable angle gloss meter (Suga UGV-5D) manufactured by Test Instruments Co., Ltd. was used, and measurement was performed at n number of 5 points under the condition of incident angle 60 ° × reflection angle 60 °.
(3) Water vapor transmission rate (g / m ² · day):
A-4 size paper laminate is cut to 10cm x 10cm size at 23 ° C and 63% RH atmosphere, and subjected to JIS K 7129 B using a water vapor transmission rate measuring device (Moderator, Permatran). The measurement was conducted at n points of 5 points under conditions of a temperature of 40 ° C. and a relative humidity of 90%.
(4) Surface resistance value (Ω / □):
A-4 size paper laminate is cut to 10cm x 10cm size in 23 ° C and 63% RH atmosphere, and subjected to JIS C2316, using a surface resistance measuring device (Mitsubishi Chemical Corporation, Loresta-EP) The n number was measured at 5 points.
(5) Application weight (weight measurement) after application and drying of the anchor coating agent (g):
After drying a 10 cm × 10 cm size paper in an oven at a temperature of 120 ° C. for 6 minutes, using a METTLER TOLEDO electronic balance METTLER TOLEDO, a sample of n samples at 5 points in a 23 ° C. × 64% RH atmosphere. The weight was measured and the coating amount of the anchor coating agent after drying was determined.

Example 1
Daiki Paper's white plywood “Tie Wrap” (thickness 40 μm), Dainichi Seika Co., Ltd. vapor deposition primer PD-4 PET-2 as an anchor coating agent, and anchor coating agent curing agent VM-D Were mixed in a predetermined composition (30 to 1.5), and further applied in an amount of 8 g / m ² in terms of the coating amount after drying, and then dried in an oven at a temperature of 120 ° C. for 6 minutes.

Next, after exhausting to a vacuum degree of 2 × 10 ⁻⁴ Torr using a single-wafer type vapor deposition machine, 99.9% aluminum is vaporized using a tungsten filament on the anchor coat coating layer so that the surface resistance value becomes 1Ω. The surface resistance value was controlled by vapor deposition time (deposition time 10 seconds) to form an aluminum vapor deposition layer to obtain a paper laminate according to the present invention (coating weight after drying of the anchor coating agent per 1 μm thickness of paper) 0.2 g / m ² ).

Example 2
Daiki Paper Co., Ltd. white interleaf paper “Tie Wrap” (thickness 40 μm), as an anchor coating agent, Dainichi Seika Co., Ltd. vapor deposition primer PD-4 PET-2, and the anchor coating agent curing agent VM-D Was formulated in a predetermined composition (30 to 1.5), and further applied in an amount of 10 g / m ² in terms of the coating amount after drying, and then dried in an oven at a temperature of 120 ° C. for 6 minutes.

Next, after exhausting to a vacuum degree of 2 × 10 ⁻⁴ Torr using a single-wafer type vapor deposition machine, 99.9% aluminum is vaporized using a tungsten filament on the anchor coating agent coating layer, resulting in a surface resistance value of 1Ω. As described above, the surface resistance value was controlled by the vapor deposition time (deposition time 10 seconds) to form the aluminum vapor deposition layer, and the paper laminated material according to the present invention was obtained (the coating after drying the anchor coating agent per 1 μm thickness of paper) Weight is 0.25 g / m ² ).

Example 3
Daiki Paper Co., Ltd. white interleaf tie wrap “Tie Wrap” (thickness 40 μm), as an anchor coating agent, Dainichi Seika Co., Ltd. vapor deposition primer PD-4 PET-2, and anchor coating agent curing agent VM-D And 15 g / m ² in terms of the coating amount after drying, and then dried in an oven at 120 ° C. for 6 minutes.

Next, after exhausting to a vacuum degree of 2 × 10 ⁻⁴ Torr using a single-wafer type vapor deposition machine, 99.9% aluminum is vaporized using a tungsten filament on the anchor coating agent coating layer, resulting in a surface resistance value of 1Ω. As described above, the surface resistance value was controlled by the vapor deposition time (deposition time 10 seconds) to form the aluminum vapor deposition layer, and the paper laminated material according to the present invention was obtained (weight after drying of the anchor coating agent per 1 μm thickness of paper) 0.38 g / m ² ).

Example 4
Daikin Paper Co., Ltd. glassine paper (thickness 40 μm), a predetermined blend of Dainichi Seika Co., Ltd. vapor deposition primer PD-4 PET-2 and anchor coat agent curing agent VM-D as an anchor coat agent (30 to 1.5), and after applying 15 g / m ² in terms of the coating amount after drying, it was dried in an oven at a temperature of 120 ° C. for 6 minutes.

Next, after exhausting to a vacuum degree of 2 × 10 ⁻⁴ Torr using a single-wafer type vapor deposition machine, 99.9% aluminum is vaporized using a tungsten filament on the anchor coating agent coating layer, resulting in a surface resistance value of 1Ω. As described above, the surface resistance value was controlled by the vapor deposition time (deposition time 10 seconds) to form the aluminum vapor deposition layer, and the paper laminated material according to the present invention was obtained (weight after drying of the anchor coating agent per 1 μm thickness of paper) 0.38 g / m ² ).

Comparative Example 1
Daiki Paper Co., Ltd. white interleaf paper “Tie Wrap” (thickness 40 μm), as an anchor coating agent, Dainichi Seika Co., Ltd. vapor deposition primer PD-4 PET-2, and the anchor coating agent curing agent VM-D Is formulated with a predetermined formulation (30 vs. 1.5), and further. After applying 5 g / m ² in terms of the coating amount after drying, it was dried in an oven at a temperature of 120 ° C. for 6 minutes.

Next, after exhausting to a vacuum degree of 2 × 10 ⁻⁴ Torr using a single-wafer type vapor deposition machine, 99.9% aluminum is vaporized using a tungsten filament on the anchor coating agent coating layer, resulting in a surface resistance value of 1Ω. As described above, the surface resistance value was controlled by the vapor deposition time (deposition time 10 seconds), and an aluminum vapor deposition layer was formed to obtain a paper laminate (Comparative Example 1) (after drying the anchor coating agent per 1 μm thickness of paper) Weight is 0.13 g / m ² ).

Comparative Example 2
Daiki Seisaku Co., Ltd. white interleaf paper “Tie Wrap” (thickness 40 μm) as an anchor coat agent with a primer for vapor deposition PD-4 PET-2 manufactured by Dainichi Seika Co., Ltd. and the anchor coat agent curing agent VM-D The mixture was prepared with a predetermined composition (30 vs. 1.5), and after applying 4 g / m ² in terms of the coating amount after drying, it was dried in an oven at a temperature of 120 ° C. for 6 minutes.

Next, after exhausting to a vacuum degree of 2 × 10 ⁻⁴ Torr using a single-wafer type vapor deposition machine, 99.9% aluminum is vaporized using a tungsten filament on the anchor coating agent coating layer so that the surface resistance value becomes 1Ω. The surface resistance value was controlled by vapor deposition time (deposition time 10 seconds), and an aluminum vapor deposition layer was formed to obtain a paper laminate (Comparative Example 2) (weight after drying of anchor coating agent per 1 μm thickness of paper) Is 0.1 g / m ² ).

Comparative Example 3
A white interleaf paper “Tie Wrap” (thickness 40 μm) manufactured by Daiko Paper Co., Ltd. is dried at 120 ° C. for 6 minutes, evacuated to 2 × 10 ⁻⁴ Torr using a single-wafer deposition machine, and then tungsten filament is used for the paper. 99.9% aluminum was vaporized, and the surface resistance value was controlled by vapor deposition time (deposition time 10 seconds) so that the surface resistance value became 1Ω, an aluminum vapor deposition layer was formed, and a paper laminate (Comparative Example 3) was formed. Obtained (no anchor coat).

  Table 1 shows the results of evaluation and comparison of the products of Examples 1 to 4 and Comparative Examples 1 to 3 thus obtained.

  From Examples 1, 2, 3, and 4, in order to obtain a water vapor barrier property that can be used for a food packaging material in a paper laminate, impregnation between paper fibers is possible and a smooth anchor coat layer is stable. It can be seen that the vapor deposition layer is essential.

  From Table 1, it can be confirmed that each example product has a low water vapor transmission rate and each comparative product has a high water vapor transmission rate.

  It can be seen that Examples 1, 2, 3, and 4 have sufficient water vapor barrier properties since the gloss after vapor deposition is high and the maximum height is low.

  Moreover, even if the kind of paper of a base material layer changes from the result of Example 4, there is no difference in the water vapor permeability obtained, and it can be confirmed that excellent water vapor barrier properties are obtained.

  On the other hand, Comparative Examples 1, 2, and 3 have insufficient moisture impregnation between the fibers of the anchor coating agent, low glossiness of the base paper, and high maximum height. I understand that there is no.

  In the case of Comparative Example 3, the aluminum vapor deposition layer was directly formed on the paper and there was no anchor coat, indicating that no water vapor barrier property after vapor deposition was obtained.

Claims (3)

A paper laminated material in which an anchor coat agent is applied to a base material layer that is paper to form an anchor coat layer or an anchor coat impregnated layer, and a metal vapor deposition layer is laminated on the anchor coat layer or the anchor coat impregnated layer And the anchor coating agent is applied at a weight after drying of 0.2 g / m ² or more per 1 μm of the thickness of the base material layer, and the incident angle after laminating the metal deposition layer is 60 ° × A paper laminate having a glossiness of 70% or more at a reflection angle of 60 ° and a water vapor transmission rate of 3 g / m ² / day or less.   The paper laminate according to claim 1, wherein the maximum height of the surface roughness on the coated surface of the anchor coat layer is 11 μm or less.   The paper laminated material according to any one of claims 1 and 2, wherein the metal forming the vapor deposition layer is metallic aluminum.