JP6884620B2 - Laminates and their manufacturing methods, containers - Google Patents

Description

The present invention relates to a laminate used for giving a roasted texture or a unique texture to foods heated in a microwave oven, a method for producing the same, and a container.

Conventionally, a laminate including a metal vapor deposition layer on which a metal such as aluminum is vapor-deposited has been used. This laminate is often used as a container, and in such cases, for example, an oxygen barrier container that enables long-term storage of food by suppressing the permeation of oxygen, or a microwave oven for the food contained in the container. It is applied to microwave oven cooking containers, etc., which are specialized for cooking.

In such an oxygen barrier container, by adjusting the formed region of the metal vapor deposition layer and the transparent non-formed region, the oxygen barrier function can be controlled, the printing effect, and the window formed of the non-formed region can be used. There was a request to make the contents visible from the outside.

Similarly, in the microwave oven cooking container, the cooking itself can be controlled by the microwave oven by adjusting the formed region of the metal vapor deposition layer and the transparent non-formed region. For example, it is possible to control cooking by baking only the formed region of the metal vapor deposition layer or by exerting a unique crispy texture (crispy texture).

In order to control the arrangement of the metal layer, a technique for creating a formed region of the metal layer and a non-formed region of the metal layer is required. Conventionally, a technique for separating a vapor-deposited metal layer sandwiched between polymer films into a plurality of regions by laser processing has been disclosed (see, for example, Patent Document 1). According to the technique disclosed in Patent Document 1, the vapor-deposited metal layer is irradiated with a YAG laser to melt the vapor-deposited metal layer, thereby forming the above-mentioned non-formed region.

However, in recent years, there has been a demand for the creation of windows that play a part in the external design of oxygen barrier containers, or for exhibiting unique printing effects. In addition, in microwave oven cooking containers, variations in the design of grilled eyes are becoming more diverse and finer, and by making the area smaller to bring out a crispy texture, it is different from the past. There is also a desire to create a different and unique crispy texture. In such a case, a technique is required in which the formed region and the non-formed region of the metal layer are formed at a fine pitch, and thus the cell-shaped formed region of the metal layer is minimized. By minimizing the cell-shaped formation region of the metal layer, the formation region of the metal layer per unit area becomes small, and the non-formation region of the metal layer per unit area further increases. In order to increase the non-formed region of the metal layer by the above-mentioned disclosure technique of Patent Document 1, it is necessary to increase the irradiation region of the YAG laser by that amount. As a result, the energy from the YAG laser per unit area increases, gas is generated, and there is a possibility that bubbles are generated between the YAG laser and the polymer film.

Patent Document 1 does not particularly disclose a technique for refining the cell-shaped formation region of such a metal layer while suppressing the generation of bubbles.

Further, in Patent Document 2, the intermediate layer made of a metal layer formed on a base material made of a synthetic resin is vaporized by irradiating it with a laser beam, and the formed region and the non-formed region of the metal layer are also formed. The technology to make is disclosed. However. Similarly, Patent Document 2 does not specifically disclose a technique for refining the cell-shaped formation region of such a metal layer while suppressing the generation of bubbles.

Jikkai Sho 57-41733 Japanese Unexamined Patent Publication No. 2007-217408

Therefore, the present invention has been devised in view of the above-mentioned problems, and an object of the present invention is to provide a roasted texture and a unique texture to foods heated in a microwave oven in a microwave oven-heated cooking container. Cell-like metal layer while suppressing the generation of air bubbles in the laminate and its manufacturing method, which is used for applying or providing a unique printing effect on the oxygen barrier container, and for providing a characteristic window. It is an object of the present invention to provide a laminate capable of forming the region of the above, a method for producing the same, and a container.

In order to solve the above-mentioned problems, the present inventors, in a laminated body in which an aluminum vapor deposition layer is sandwiched between a base material and a surface layer, the base material is irradiated with a laser beam including an absorption wavelength of aluminum. Invented a laminate characterized by absorbing or permeating the gas generated thereby.

The laminate according to the first invention is a laminate in which an aluminum-deposited layer is sandwiched between a base material and a surface layer, and the base material emits gas generated by irradiation with a laser beam containing an absorption wavelength of aluminum. The aluminum-deposited layer, which is absorbed or transmitted, is characterized by including a region that has been made transparent by being irradiated with the laser beam.

The laminate according to the second invention is a laminate in which an aluminum-deposited layer is sandwiched between a base material and a surface layer, and the base material emits gas generated by irradiation with a laser beam containing an absorption wavelength of aluminum. By absorbing or permeating the gas and absorbing or permeating the gas by the base material, the generation of bubbles is suppressed between the aluminum vapor deposition layer and the base material or the surface layer. To do.

Laminate according to the third invention, Oite the first shot bright, in the transparent region is characterized in that aluminum oxide is present.

The laminate according to the fourth invention is any of the first to third inventions, wherein the base material is made of paper, a non-woven fabric, a porous body, or a resin containing a porous material . It is characterized by.

Container according to a fifth invention comprises a housing part, in the accommodating portion, and wherein the laminate is found provided according to any of the first invention to the fourth invention.

The method for producing a laminate according to the sixth invention is a method for producing a laminate in which an aluminum vapor deposition layer is sandwiched between a base material and a surface layer, and the aluminum vapor deposition layer is irradiated with a laser beam including an absorption wavelength of aluminum. The gas generated by the irradiated laser beam is absorbed by the base material or transmitted through the base material .

In the sixth invention, the method for producing a laminate according to the seventh invention is to absorb the gas by the base material composed of any of paper, a non-woven fabric, a porous body, and a resin containing a porous material. Alternatively, it is characterized by being transparent.

According to the present invention having the above-described configuration, particularly when applied to a microwave oven cooking container, the region where the metal layer is formed is made finer, and the food is cooked in a microwave oven using this. As a result, it is possible to realize diversification and miniaturization of the variation of the design of the grilled texture, and it is also possible to form an area for exhibiting a crispy texture. As a result, it is possible to give a unique crispy feeling to the food to be cooked. Further, according to the present invention, when applied to an oxygen barrier container, it is possible to exert a unique printing effect through the formed region or the non-formed region of the metal layer, and the shape of the transparent non-formed region and the shape of the transparent non-formed region. By controlling the position, it is possible to form a window having a characteristic shape.

In the present invention, together with this, the gas generated by the irradiated laser beam can be absorbed or transmitted by the base material, and the generation of air bubbles between the aluminum vapor deposition layer and the base material or the surface layer can be suppressed. It will be possible. By suppressing the generation of these bubbles, it is possible to prevent the visual aesthetic appearance from being impaired when visually confirmed.

It is a perspective view which shows the laminated structure of the laminated body to which this invention is applied. It is another perspective view which shows the laminated structure of the laminated body to which this invention is applied. It is a figure for demonstrating the manufacturing method of the laminated body to which this invention is applied. It is a figure for demonstrating an example of irradiating an aluminum film-deposited layer with a laser beam. It is a figure which shows the state which expanded the irradiation area by a laser beam. It is a figure which shows the example which comprises the non-irradiation region in the shape which is continuous with each other. It is sectional drawing of the laminated body irradiated with a laser beam. It is a perspective view which shows the example which applied the laminated body to which this invention was applied to a container. It is a figure for demonstrating the mode of storing food in the container shown in FIG. 8 and heating in a microwave oven.

Hereinafter, the laminate to which the present invention is applied will be described in detail with reference to the drawings.

As shown in FIG. 1, the laminate 1 to which the present invention is applied includes a base material 2, an aluminum-deposited layer 3 laminated on the base material 2, and a surface layer 4 laminated on the aluminum-deposited layer. There is. The aluminum vapor deposition layer 3 is sandwiched between the base material 2 and the surface layer 4.

The base material 2 is made of, for example, a porous material such as paper, non-woven fabric, zeolite, talc, activated carbon, etc., a resin containing the porous material, a gas permeable film, and the like. The base material 2 may be composed of a single layer made of the same material, but different materials may be laminated over two or more layers. In such a case, as shown in FIG. 2, the upper layer 21 of the base material 2 is composed of the above-mentioned paper, zeolite or the like, and the lower layer 22 of the base material 2 is polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET). ) Or other resin material may be used. The upper layer 21 and the lower layer 22 of the base material 2 may be laminated with the lower layer 22 on the upper layer 21 by an extrusion laminating method, or the upper layer 21 and the lower layer 22 may be laminated with an adhesive.

When applied to a microwave oven-heated cooking container, the aluminum vapor-deposited layer 3 plays a role of generating eddy current and generating Joule heat when irradiating microwaves in the microwave oven, and is used for roasting or original foods. Give the texture of. Further, the aluminum vapor deposition layer 3 exerts a visual shielding effect from the outside when applied to an oxygen barrier container. The aluminum vapor deposition layer 3 may be made of an aluminum foil, a metal foil such as an aluminum alloy, or the like.

It has been found that such an aluminum vapor-deposited layer 3 has a property of changing to aluminum oxide which becomes transparent when irradiated with a _{YAG (yttrium aluminum garnet) laser beam or a YVO 4 (yttrium vanadate) laser beam from the outside.} ..

The film thickness of the aluminum vapor deposition layer 3 is, for example, 1 to 500 nm, and preferably 5 to 200 nm.

The surface layer 4 is made of, for example, a PA resin such as nylon, a polyolefin resin such as polypropylene (PP) or polyethylene (PE), a polyester resin such as polyethylene terephthalate (PET), or the like, and is composed of a single layer or a composite multilayer thereof. .. The surface layer 4 may be formed of a stretched film stretched in the uniaxial direction or the biaxial direction when it plays a role of reinforcing the strength.

Next, a method for manufacturing the laminated body 1 to which the present invention having the above-described configuration is applied will be described.

First, as shown in FIG. 3A, the aluminum vapor deposition layer 3 is vapor-deposited on the surface layer 4. This vapor deposition may be based on any method, but as an example, a method of laminating by vacuum deposition may be applied. Next, as shown in FIG. 3B, the base material 2 is adhered to the aluminum vapor deposition layer 3 laminated on the surface layer 4 via the adhesive 5. As the adhesive 5, polyurethane, polyether, polyester, epoxy resin and the like are used. When the base material 2 is composed of the upper layer 21 and the lower layer 22, PET, PE or the like as the lower layer 22 is formed from the bottom surface of the paper or the porous material as the upper layer 21.

Next, as shown in FIG. 4A, the aluminum vapor deposition layer 3 is irradiated with a laser beam. The laser beam to be irradiated is, for example, a YAG laser beam, a YVO ₄ laser beam, or the like, and is premised on including at least an absorption wavelength band of aluminum. The laser light is irradiated by irradiating the laminated body 1 with the laser light emitted from the laser irradiation device 10. The case where the laser light emitted from the laser irradiation device 10 passes through the surface layer 4 of the laminated body 1 and irradiates the aluminum vapor deposition layer 3 will be described as an example. Even in such a case, the laser beam transmitted through the base material 2 will reach the aluminum vapor deposition layer 3 in the same manner. That is, as long as the laser beam irradiation from the laser irradiation device 10 reaches the aluminum vapor deposition layer 3, it may be transmitted from either the lower side of the base material 2 or the upper side of the surface layer 4.

When the aluminum vapor-deposited layer 3 is irradiated with the laser beam, the aluminum vapor-deposited layer 3 itself absorbs the laser beam because the laser beam includes the absorption wavelength band of aluminum. As a result, the aluminum-deposited layer 3 combines with oxygen existing in the adjacent adhesive layer 5 and changes to aluminum oxide. At this time, in the irradiation region of the laser beam, when all the aluminum vapor deposition layer 3 is changed to aluminum oxide, or a part of the aluminum vapor deposition layer 3 is changed to aluminum oxide, and the rest is sublimated and gasified. May be. By the way, this aluminum oxide is transparent. Therefore, the irradiation region of the laser beam can be made transparent by changing the aluminum vapor deposition layer 3 to aluminum oxide. In other words, by adjusting the irradiation region of the laser beam in advance, the aluminum vapor deposition layer 3 is changed to aluminum oxide to make it transparent, and by not irradiating the laser beam, the aluminum vapor deposition layer 3 remains as it is. It is possible to freely allocate an area.

In the example of FIG. 4B, the laser beam is irradiated so as to form a grid in a plan view. As a result, only the lattice-shaped irradiation region 11 on which the laser beam is irradiated on the aluminum vapor deposition layer 3 changes to aluminum oxide and becomes transparent, and the non-irradiation region other than the irradiation region 11 remains unchanged from being changed to aluminum oxide. The aluminum vapor deposition layer 3 remains.

FIG. 5 shows an enlarged state of the irradiation region 11 by such a laser beam. Since the irradiation region 11 made of transparent aluminum oxide has a grid pattern, the non-irradiation region 12 surrounded by the irradiation region 11 has an aluminum vapor deposition layer 3 having a substantially rectangular shape in a plan view. It is composed of cells. Specifically, the non-irradiated region 12 is composed of a cell shape in which the boundary with the irradiated region 11 is not clear toward the end of the cell, in other words, a cell shape in which the periphery of the end is gradation. The broken line in the figure indicates that the gradation is formed. That is, the aluminum vapor-deposited layer 3 is finished in a state where such cell-shaped non-irradiated regions 12 are formed over a plurality of locations. By finely controlling the irradiation region of the laser beam in this way, it is possible to finely adjust the cell-shaped non-irradiation region 12 or the irradiation region 11 of the aluminum vapor deposition layer 3.

In the above-described embodiment, the case where the shape of the non-irradiated region 12 is composed of rectangular cells in a plan view has been described as an example, but the present invention is not limited to this. The plan-view shape of the cell in the non-irradiated region 12 may be any regular or irregular shape such as another polygon, a circle, or an ellipse. In order to actually control the shape of the cell in the non-irradiation region 12, it is necessary to adjust the irradiation region 11 on the laser irradiation device 10 side.

Further, the non-irradiation region 12 is not limited to the case where the periphery is in the shape of a cell surrounded by the irradiation region 11, and may be in a shape continuous with each other as shown in FIG. The broken line in the figure indicates that the gradation is formed.

FIG. 7 is a cross-sectional configuration diagram of the laminated body 1 irradiated with such a laser beam. In the vicinity of the laser beam irradiation region 11, for example, the adhesive 5 in the vicinity is vaporized by the energy generated when the aluminum vapor deposition layer 3 is changed to aluminum oxide by the laser beam irradiation, and gas is generated. It is inferred that. It is also considered that the aluminum vapor deposition layer 3 is sublimated by the irradiation of the laser beam to generate gas. The generated gas passes through the adhesive layer 5 and is absorbed by the base material 2. This is because the adhesive layer 5 itself is made of a gas-permeable material, so that the generated gas is permeated, or the adhesive layer 5 is vaporized to generate cracks in the layer, and the gas causes the cracks. It is presumed that it has passed. Since the base material 2 is made of paper or a porous material, the gas generated can be taken in and supported. As a result, in the base material 2, an absorption region in which the generated gas is absorbed is formed inside. Alternatively, the generated gas may permeate through the base material 2 and seep out to the outside. Further, in the region irradiated with the laser beam, the surface layer 4 and the aluminum vapor deposition layer 3 are in a pseudo-adhesive state.

As a result of all the generated gases being absorbed by the base material 2 or permeating through the base material 2, the generation of air bubbles between the aluminum vapor deposition layer 3 and the base material 2 or the surface layer 4 is suppressed. Is possible. In other words, it is possible to obtain a laminated body having no air bubbles between the aluminum vapor deposition layer 3 and the base material 2 or the surface layer 4. By suppressing the generation of air bubbles, the visual aesthetic appearance is not spoiled when visually confirmed.

The laminate 1 produced in this manner may be applied to any application, and may be applied to, for example, a container 7 as shown in FIG.

The container 7 includes a storage unit 71 for storing food. The laminate 1 is formed on the food storage surface side of the storage portion 71. FIG. 8 shows an example in which the laminated body 1 is formed on the bottom surface of the accommodating portion 71. A plurality of non-irradiated areas 12 as rectangular cells surrounded by the irradiated area 11 are scattered on the bottom surface of the accommodating portion 71.

When such a container 7 is applied to a microwave oven cooking container, the food 8 is stored as shown in FIG. 9 and heated in the microwave oven. As a result, the food 8 is irradiated with microwaves from the microwave oven, and it becomes possible to heat the food 8 through the frictional heat generated between the molecules constituting the food 8.

At the same time, an overcurrent flows in the process of the microwave passing through the aluminum vapor deposition layer 3, and Joule heat is generated. In the aluminum-deposited layer 3, since the vapor-deposited aluminum remains in the cell-shaped non-irradiated region 12, Joule heat is locally generated from the non-irradiated region 12. As a result, Joule heat generated from the non-irradiated region 12 acts on the region close to the non-irradiated region 12 in the food 8, and the food 8 is heated intensively. It is possible to give or give a crispy and unique texture (crispy feeling). In particular, by applying browning having excellent design to the food 8, it is possible to finish the food 8 with particular attention to design. In addition, by intentionally expressing a crispy feeling in a local region, it is possible to feel a unique chewy texture, and it is possible to achieve the uniqueness and differentiation of the finished food 8.

The plurality of non-irradiated regions 12 as rectangular cells surrounded by the irradiated region 11 may be formed on a surface other than the bottom surface of the accommodating portion 71, or may be formed on the inner surface of the accommodating portion 71, for example.

Further, when the container 7 is applied to an oxygen barrier container, it is possible to exert a unique printing effect through the irradiation region 11 or the non-irradiation region 12, and to control the shape and position of the transparent irradiation region 11. It is possible to form a window with a characteristic shape.

Needless to say, the container 7 may be applied to any purpose other than accommodating foods and beverages.

In the present invention, PET is used as the surface layer 4, but another resin material may be used as long as the laser beam irradiated with an output capable of heating the aluminum vapor deposition layer 3 can be transmitted. A multi-layer structure in which the resin layers of the above are laminated may be used.

1 Laminated body 2 Base material 3 Aluminum vapor deposition layer 4 Surface layer 5 Adhesive 7 Container 8 Food 10 Laser irradiation device 11 Irradiation area 12 Non-irradiation area 21 Upper layer 22 Lower layer 71 Storage unit

Claims (7)

In a laminated body in which an aluminum vapor deposition layer is sandwiched between a base material and a surface layer,
The base material absorbs or transmits gas generated by irradiation with a laser beam containing an absorption wavelength of aluminum.
The aluminum-deposited layer is a laminated body including a region that has been made transparent by being irradiated with the laser beam. In a laminated body in which an aluminum vapor deposition layer is sandwiched between a base material and a surface layer,
The base material absorbs or transmits gas generated by irradiation with a laser beam containing an absorption wavelength of aluminum.
A laminate characterized in that the generation of air bubbles is suppressed between the aluminum vapor deposition layer and the base material or the surface layer by absorbing or permeating the gas by the base material. The aforementioned transparent areas, the laminate of claim 1 Symbol mounting, characterized in that aluminum oxide is present. The laminate according to any one of claims 1 to 3, wherein the base material is made of any of paper, a non-woven fabric, a porous body, and a resin containing a porous material. Equipped with a housing
A container characterized in that the accommodating portion is provided with the laminate according to any one of claims 1 to 4. In a method for manufacturing a laminate in which an aluminum vapor deposition layer is sandwiched between a base material and a surface layer,
The aluminum vapor deposition layer is irradiated with a laser beam containing an absorption wavelength of aluminum.
A method for producing a laminate, which comprises absorbing the gas generated by the irradiated laser beam by the base material or transmitting the gas through the base material. The laminate according to claim 6, wherein the gas is absorbed or permeated by the base material composed of any of paper, a non-woven fabric, a porous body, and a resin containing a porous material. Method.

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