JP2006273391A - Packaging film and shading cover for liquid transporting container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging film showing a superior light-shielding characteristic against not only ultraviolet rays but also visible lights, visually recognizing a packaged item without arranging any window there, and also to provide a shading cover for a liquid transporting container. <P>SOLUTION: This packaging film is treated by ultraviolet shielding for absorbing or shielding ultraviolet rays, and provided with: a coloring ink layer 7; and a base film 5 composed of a film having a metallic half vapor deposited layer 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packaging film suitable for packaging a product that is easily altered by light, and a shading cover for an infusion container.

Conventionally, a packaging film having a light shielding property has been used as a packaging material for packaging an article requiring light shielding. For example, infusion solutions containing vitamins, amino acids and the like are easily altered by light and are required to shield not only ultraviolet rays but also part of visible rays.
Therefore, conventionally, when an infusion solution is administered, a light-shielding cover is covered so as to cover the periphery of the infusion container.
As such a light shielding cover for an infusion container, for example, one disclosed in JP-A-2003-275280 is known. The light shielding cover of this publication is a polyethylene terephthalate film substrate provided with an ultraviolet absorbing / light shielding ink layer, except for a window portion for viewing contents, and a packaging film provided with a brown light shielding colored ink layer. The part other than the window part is a film having a light transmittance of 5% or less at a wavelength of 400 nm or less and a light transmittance of a wavelength of 400 to 800 nm of 50% or less, and the window part has a wavelength of 400 nm. The following light transmittance is 5% or less, and light transmittance with a wavelength of 600 nm or more is 50% or more. The conventional light-shielding cover provided with such a window part can visually recognize the infusion volume through the window part.

  However, the packaging film used for the light-shielding cover has a relatively narrow area of the window, so it is difficult to confirm the amount of infusion, and the window has a high (bad) visible light transmittance. There is a risk that the infusion solution may be altered by the light rays entering from the window. In this regard, when the window portion is wide, the visibility is improved, but the light shielding property is lowered. On the other hand, when the window portion is narrowed, the light shielding property is improved, but the visibility is further deteriorated.

JP 2003-275280 A

  Then, this invention makes it a subject to provide the packaging film which is excellent in light-shielding not only of ultraviolet rays but visible light, and can visually recognize a packaging article without providing a window part, and the light-shielding cover for infusion containers. .

  As a means for solving the above-mentioned problems, the present invention provides a packaging in which an ultraviolet blocking treatment for absorbing or blocking ultraviolet rays is applied and a colored ink layer is provided, and the base film is a film having a metal half vapor deposition layer. Provide film.

Further, in a preferred embodiment of the present invention, the metal half-deposited layer is the above packaging film containing tin as a main component, and the light transmittance at a wavelength of 200 to 500 nm is 5% or less and the light transmittance at a wavelength of 500 to 800 nm. The packaging film having a rate of 60% or less is provided.
The packaging film can also be used as a light shielding cover for infusion containers.

  The packaging film and the light shielding cover for an infusion container of the present invention can shield ultraviolet rays and visible light, and can visually recognize an article from the entire surface of the film. Therefore, it is not necessary to form a visual window portion as in the case of a conventional light-shielding cover, and an article packaged from outside can be confirmed at a glance.

Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing the layer structure of the packaging film of the present invention.
The packaging film 1 includes, in order from the upper layer, a base film 5 in which the metal half vapor deposition layer 3 is provided on the inner surface of the film layer 2 mainly constituting the packaging film 1 and an ultraviolet absorption blocking layer 6 provided as an ultraviolet absorption / blocking treatment. And a colored ink layer 7 and a sealant layer 8.
As the film layer 2, for example, one or two selected from polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, polystyrenes such as polystyrene, cyclic olefins, polyvinyl chloride, polyamide, polycarbonate, and the like. Films composed of the above-mentioned mixtures and the like, and laminated films thereof can be used, and it is preferable to use a polyester-based film such as polyethylene terephthalate because it is versatile, has heat resistance, and is excellent in strength. . The film layer 2 is a film that has been subjected to ultraviolet absorption / blocking treatment, such as a film formed of a resin composition kneaded with an ultraviolet absorption / blocking agent, or a film infiltrated with an ultraviolet absorption / blocking agent. It can also be used. The thickness of the film layer 2 is about 10 to 70 μm.

The metal half vapor deposition layer 3 is thinner than normal vapor deposition and has a high total light transmittance. In the present invention, the base film 5 (metal half vapor deposition) having a total light transmittance (conforming to JIS K 7136-1 (visible region 380 to 800 nm)) of approximately 30 to 60%, preferably approximately 35 to 50%. Preference is given to using a film layer 2) provided with a layer 3. This is because the base film 5 having a total light transmittance of less than 30% has poor visibility, and if it exceeds 60%, the light shielding property is lowered.
The metal material constituting the metal half vapor deposition layer 3 is not particularly limited as long as it can be vapor deposited on the film layer 2. For example, tin (tin), aluminum, chromium, nickel, titanium, copper, gold, silver, etc. 1 type, or 2 types or more selected from these metals, metal compounds or metal alloys thereof. Among these, a vapor deposition layer containing tin as a main component (in the case of a compound such as an alloy or an oxide, the maximum amount of tin element) is preferable because of less irregular reflection of light and relatively low brightness. The thickness of the metal half vapor deposition layer 3 is preferably about 0.001 to 0.02 μm (10 to 200 cm), and more preferably about 0.005 to 0.015 μm (50 to 150 mm). This is because if it is thinner than this, the light shielding property is lowered, whereas if it is thicker than this, the visibility is deteriorated. As a vapor deposition method, it can vapor-deposit by conventionally well-known methods, such as a vacuum vapor deposition method, sputtering method, an ion plating method, CVD (chemical vapor deposition) method, for example.

As the ultraviolet absorption blocking layer 6, organic ultraviolet absorbers such as benzotriazole compounds, benzophenone compounds, cyanoacrylate compounds, salicylate compounds, inorganic ultraviolet blocking agents such as titanium oxide, zinc oxide, and cerium oxide are used. Can be used. The ultraviolet absorbing or blocking agent is dispersed and dissolved in a suitable binder, and the ultraviolet absorbing blocking layer 6 is laminated on the entire inner surface of the vapor deposition layer 3 of the base film 5 by a printing method such as a gravure coating method.
In addition, the layer which comprises the packaging film 1 like the case where the film in which the ultraviolet-ray absorption and interruption | blocking process was performed is used as the film layer 2, or the ink containing an ultraviolet absorber etc. is used as the colored ink layer 7. In the case where the UV absorption / blocking treatment is applied to the UV absorption blocking layer 6, the UV absorption blocking layer 6 can be omitted. Further, as the ultraviolet absorption blocking layer 6, a separate film subjected to ultraviolet absorption / blocking treatment may be laminated on the base film 5.

Next, when the colored ink layer 7 is printed on what has been subjected to ultraviolet absorption / blocking treatment, the light transmittance at a wavelength of 380 to 500 nm can be suppressed to 5% or less, and visibility is ensured. The printing ink for film which can be used can be used, for example, the ink which exhibits yellow, vermilion, orange, red, etc. can be used. Among these, it is preferable to use an ink exhibiting a warm color such as yellow or vermilion because the packaged article is more easily visible. The colored ink layer 7 can be applied once or divided into two or more times, and it is particularly preferable to apply different colors (for example, a combination of yellow and vermilion) at least once.
Further, the colored ink layer 7 can be blended with an ultraviolet absorber or an ultraviolet blocking agent. The thickness of the colored ink layer 7 is preferably about 0.5 to 5 µm, more preferably about 1 to 5 µm. The colored ink layer 7 is formed on the entire inner surface of the film by a conventional printing method such as gravure printing or flexographic printing.
In addition, when forming an ink layer, you may mix and adjust density | concentration by adding transparent ink which does not contain colorant components, such as transparent medium ink, to the ink to apply | coat.

  The sealant layer 8 is not particularly limited as long as it can be thermally welded. For example, polyethylene such as linear low density polyethylene, high density polyethylene, and metallocene catalyst polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and the like are used. be able to. The sealant layer 8 can be laminated, for example, on the inner surface side of the base film 5 by a dry laminating method or the like. Among these laminating methods, laminating by the dry laminating method is preferable because the surface of the sealant layer 6 has small irregularities and a more transparent laminated film can be obtained. The packaging film 1 provided with the sealant layer 8 is preferable because it can be easily formed into a bag shape by heat sealing or the like, but the packaging film 1 without the sealant layer 8 may be used.

  The packaging film 1 has a light transmittance at a wavelength of 200 to 500 nm of 5% or less, and further, a colored ink layer 7 is provided on the base film 5 on which metal half vapor deposition is performed. Is 60% or less, preferably 50% or less, and is excellent in light shielding properties. Moreover, since the packaging film 1 of the present invention can also use a relatively light-colored ink such as yellow or vermilion as the colored ink layer 7, for example, as compared with a conventional film colored brown, The packaged article can be seen more clearly. Therefore, it is not necessary to form a window part or the like in part as in the conventional example, and the packaging film 1 of the present invention can visually recognize an article on the entire surface of the film.

Such a packaging film 1 is used after being appropriately formed into a shape, and in particular, articles containing substances such as vitamins and amino acids that are said to be altered in a wavelength region of 500 nm or less, such as pharmaceuticals such as infusion solutions, vitamins, etc. It is suitable for packaging beverages, cosmetics, fresh foods, and other arts such as paintings that contain foods and amino acids.
FIG. 2 shows a light shielding cover for an infusion container as an application example of the packaging film 1.
The light shielding cover 10 is formed in a bag shape so that it can be externally fitted to the infusion container. Specifically, the light shielding cover 10 includes two film pieces 1a and 1a formed by appropriately forming the packaging film 1 in a rectangular shape, with the sealant layers facing each other, and heat-sealing both side edges. The upper end edges of the two film pieces 1a and 1a are heat-sealed except for the upper opening secured at the center of the upper edge.
The light-shielding cover 10 is used by covering the infusion container from the lower opening, and peeping the suspended portion of the infusion container from the upper opening.

  The layer structure of the packaging film 1 of the present invention is not limited to the one exemplified above. For example, the colored ink layer 7 / film layer 2 / metal half vapor deposition layer 3 / ultraviolet absorption blocking layer 6 / sealant layer in order from the upper layer. 8, UV absorption blocking layer 6 / film layer 2 / metal half vapor deposition layer 3 / colored ink layer 7 / sealant layer 8, colored ink layer 7 containing ultraviolet absorber / metal half vapor deposition layer 3 / film layer 2 / sealant layer 8 It can also be changed to various layer configurations. When the film layer 2 consists of a multilayer film, the base film 5 which laminates | stacks the metal half vapor deposition layer 3 in the middle may be sufficient. However, since visibility decreases due to irregular reflection of light, the metal half vapor deposition layer 3 is preferably configured not to be a surface layer of the packaging film 1 (the metal half vapor deposition layer 3 is not exposed).

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the following examples.
(Printing ink and coating agent used)
Yellow ink containing ultraviolet absorber (hereinafter referred to as “ultraviolet absorbing yellow ink”) manufactured by Toyo Ink Mfg. Co., Ltd., trade name: Multiset V Conch Yellow.
Yellow ink: manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: NT Hiramic 723 Yellow.
Vermilion ink: manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: HR color 950 vermilion (LX).
Coating agent containing an ultraviolet absorber (hereinafter referred to as “ultraviolet absorbing coating agent”) manufactured by Toyo Ink Manufacturing Co., Ltd., trade name: N532LP Clear UVS.

Example 1
Prepared a vapor-deposited film (trade name: # 25 Tetrait Sn T = 40%, manufactured by Oike Kogyo Co., Ltd.) on which an inner half of a polyethylene terephthalate film having a thickness of 25 μm and a tin half vapor-deposited layer (vacuum vapor deposition) having a thickness of 120 mm were formed. did. This tin-deposited film has a total light transmittance of about 40% (however, this total light transmittance is based on specifications provided by Oike Industry Co., Ltd.). About this tin vapor deposition film, the light transmittance was measured with the following measuring method. The result is shown in the graph of FIG.
A vermilion ink was solid-printed on the vapor deposition surface of the vapor deposition film by a gravure printing method to form a vermilion ink layer (dry thickness: about 1.0 μm). Further, from above, the UV-absorbing yellow ink is solid-printed by a gravure printing method to form an UV-absorbing yellow ink layer (dry thickness of about 1.0 μm). did. About the obtained film, the light transmittance in wavelength 200-800 nm was measured. The result is shown in FIG.
The light transmittance is measured using an integrating sphere type light transmittance measuring device (manufactured by Shimadzu Corporation, trade name: UV-2450) in accordance with JIS K 7105. (The product name: ISR-2200, manufactured by Shimadzu Corporation) is attached.) Hereinafter, the light transmittance of each film was measured with the same measuring apparatus.

(Example 2)
A film of Example 2 was produced in exactly the same manner as in Example 1 except that an equal amount of medium ink was added to the vermilion ink of Example 1 and a thin vermilion ink having a half colorant concentration was used. The light transmittance was similarly measured about the obtained film. The result is shown in FIG.
(Example 3)
A film of Example 3 was produced in exactly the same manner as in Example 1 except that the vermilion ink layer of Example 1 was not provided and the ultraviolet-absorbing yellow ink was applied three times on the vapor deposition surface of the vapor deposition film. The light transmittance was similarly measured about the obtained film. The result is shown in FIG.
Example 4
On the vapor deposition surface of the same vapor deposition film as in Example 1, a yellow ink is solid-printed by a gravure printing method to form a yellow ink layer (dry thickness: about 1.0 μm). I painted it over again. From this, the ultraviolet absorbing coating agent was solid-coated by gravure printing to form an ultraviolet absorbing layer (dry thickness of about 1.0 μm), and the coating agent was further applied from above. The light transmittance was similarly measured about the obtained film. The result is shown in FIG.

(Example 5)
Polyethylene terephthalate film having a thickness of 25 μm on which an aluminum half-deposition layer (vacuum deposition) having a thickness of 80 mm is formed (manufactured by Oike Kogyo Co., Ltd., trade name: # 25 tetraite Al T = 40%, total light transmittance about 40%) A polyethylene terephthalate film (produced by Teijin DuPont Films, Inc., trade name: Teijin Tetron Film HB) having a thickness of 25 μm formed by mixing an ultraviolet absorber was laminated on the vapor-deposited surface with an adhesive.
A yellow ink layer (dry thickness: about 1.0 μm) was formed on this film by solid printing of yellow ink by a gravure printing method. Further, from this, vermilion ink was solid-printed by a gravure printing method to form a vermilion ink layer (dry thickness: about 1.0 μm). The light transmittance was similarly measured about the obtained film. The result is shown in FIG.
(Example 6)
As a vapor-deposited film, a 25 μm thick polyethylene terephthalate film (made by Oike Kogyo Co., Ltd., product name: # 25 tetraite Ni T = 40%, total light transmittance) A film in which a polyethylene terephthalate film (trade name: Teijin Tetron Film HB, manufactured by Teijin DuPont Films Co., Ltd.) having a thickness of 25 μm formed by mixing an ultraviolet absorber on the vapor deposition surface is laminated with an adhesive. A film was produced in the same manner as in Example 5 except that was used. The light transmittance was similarly measured about the obtained film. The result is shown in FIG.
(Example 7)
Aluminum vapor-deposited film (Oike Kogyo Co., Ltd., trade name: # 25 Tetrait Al T = 30%, 100% thick aluminum vapor-deposited layer (vacuum vapor-deposited) formed on the inner surface of a 25 μm thick polyethylene terephthalate film Light transmittance of about 30%) was prepared.
A yellow ink layer (dry thickness: about 1.0 μm) was formed on the vapor-deposited surface of the base film by solid printing of yellow ink by a gravure printing method. Further, a mixture of yellow ink and vermilion ink in a ratio of 9: 1 by weight was solid-printed by gravure printing to form a mixed color ink layer (dry thickness: about 1.0 μm). Further, an ultraviolet absorbing coating agent was solid-coated by a gravure printing method from above to form an ultraviolet absorbing layer (dry thickness about 1.0 μm). The light transmittance was similarly measured about the obtained film. The result is shown in FIG.

(Comparative Example 1)
On the vapor deposition surface of the same vapor deposition film as in Example 1, an ultraviolet absorbing coating agent was solid-coated by gravure printing to form an ultraviolet absorbing layer (dry thickness of about 1.0 μm). About the obtained film, the light transmittance in wavelength 200-800 nm was measured. The result is shown in FIG.
(Comparative Example 2)
A yellow ink layer (dry thickness: about 1.0 μm) was formed on the vapor deposition surface of the same vapor deposition film as in Example 1 by solid printing of yellow ink by a gravure printing method. The light transmittance was similarly measured about the obtained film. The result is shown in FIG.
(Comparative Example 3)
A yellow ink layer (dry thickness: about 1.0 μm) was formed on the inner surface of a 25 μm thick polyethylene terephthalate film (without a metal vapor deposition layer) by solid printing of yellow ink by a gravure printing method. Further, an ultraviolet absorbing coating agent was solid-coated by a gravure printing method from above to form an ultraviolet absorbing layer (dry thickness about 1.0 μm). The light transmittance was similarly measured about the obtained film. The result is shown in FIG.

  As shown in FIG. 3, the films of Examples 1, 2, 5 and 6 have a light transmittance of 200 to 500 nm of about 1% or less, and the films of Examples 3 and 7 have about 3% or less. The film of Example 4 was about 5% or less. Further, the films of Examples 1 and 5 to 7 had a light transmittance of 800 or less and about 50% or less, and the films of Examples 2 to 4 were about 60% or less. All were excellent in the blocking | blocking property of an ultraviolet-ray and visible light, and the result which laminated | stacked vermilion and yellow as a colored ink like Example 1 and 2 became a preferable result especially.

Next, the film of the said Example and the comparative example was made into the bag shape by making the outer surface (surface opposite to a vapor deposition surface) of a vapor deposition film into the surface, and produced the cover. Using such a cover, a separately prepared infusion container (a bag in which about half of the yellow infusion solution was sealed in a colorless and transparent synthetic resin bag) was covered, and this was hung about 50 cm in front of a white wall and separated by 100 cm. From the position, it was confirmed whether the infusion liquid line could be seen through the cover.
The results are shown in Table 1.

Sectional drawing which shows one Embodiment of the packaging film of this invention. The perspective view which shows the light-shielding cover for infusion containers of this invention. The graph which shows the light transmittance of an Example. The graph which shows the light transmittance of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging film, 2 ... Film layer, 3 ... Metal half vapor deposition layer, 5 ... Base film, 6 ... Ultraviolet absorption blocking layer, 7 ... Colored ink layer, 8 ... Sealant layer, 10 ... Shading cover

Claims (4)

  A packaging film which is subjected to ultraviolet ray blocking treatment for absorbing or blocking ultraviolet rays and is provided with a colored ink layer, wherein the base film is a film having a metal half vapor deposition layer.   The packaging film according to claim 1, wherein the metal half-deposited layer is mainly composed of tin.   The packaging film according to claim 1 or 2, wherein the light transmittance at a wavelength of 200 to 500 nm is 5% or less and the light transmittance at a wavelength of 500 to 800 nm is 60% or less. The light shielding cover for infusion containers formed with the packaging film in any one of Claims 1-3.

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