JP2014031214A - Packaging material and package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material and package which enable an accurate inspection of foreign matter using infrared radiation even when the packaging material and package have a color of high lightness such as white, light blue, pink, and light green.SOLUTION: A packaging material comprises a laminate including a base material layer, a print layer and a transparent infrared reflection layer in order, wherein the transparent infrared reflection layer is made by dispersing aluminum flakes in a transparency resin.

Description

  The present invention relates to a packaging material and a package.

  Conventionally, a foreign matter inspection method for a package using infrared rays (infrared light) has been known, and some of them have already been put into practical use. In general, in the foreign matter inspection method using infrared rays, the package body is irradiated with infrared rays, and the presence or absence of foreign matter can be detected by the contrast of the reflected light. More specifically, the foreign object absorbs infrared rays, and as a result, the foreign object is detected as a dark area in a bright background. For this reason, at the time of foreign matter inspection by infrared rays, it is necessary to prevent such a contrast from occurring in the packaging material itself (packaging material without foreign matter). In other words, packaging materials usually have printed layers depicting characters, figures, etc., but such printed layers must be designed to assimilate the background without causing contrast. I must. Otherwise, it is not possible to accurately detect the foreign matter present immediately above the printing layer.

  As a package suitable for detecting foreign matter using infrared rays, a method has been proposed in which, for example, a printing layer in which a plurality of pigments are mixed is used instead of a printing layer colored with carbon black that does not transmit infrared rays (Patent Document 1). According to this technology, since the print layer transmits infrared rays, the print layer itself hardly causes contrast. As a result, only foreign matter causes contrast. As a result, even if the foreign matter exists directly above the print layer, Accurate detection is possible.

JP 2004-239889 A

  However, when two or more kinds of pigments are mixed and used in the printing layer as in Patent Document 1, there is no problem when the color required for printing is low brightness such as black or dark green. In the case of high brightness including a white pigment (titanium oxide pigment), infrared transmittance is sacrificed by the white pigment. And as the white pigment content increases, the amount of transmitted infrared rays also decreases. When the content exceeds a certain content, the foreign matter not only causes contrast but also the printed layer causes contrast. Since it becomes difficult to distinguish between the foreign matter and the printed layer, it is difficult to perform the foreign matter inspection with high accuracy. On the other hand, the demand for high-brightness printed layers is increasing as package designs are diversified.

Accordingly, the main object of the present invention is to provide a packaging material and a packaging body capable of accurately performing foreign matter inspection using infrared rays even in high brightness colors such as white, light blue, pink, and light green. Is to provide.

  As a result of intensive studies in view of the problems of the prior art, the present inventor has found that the above object can be achieved by adopting a specific layer structure, and has completed the present invention.

That is, the present invention relates to the following packaging material and package.
1. A packaging material comprising a laminate comprising a base material layer, a printing layer and a transparent infrared reflective layer in this order, wherein the transparent infrared reflective layer comprises aluminum flakes dispersed in a transparent resin.
2. Item 2. The packaging material according to Item 1, further comprising a resin film layer on the transparent infrared reflective layer.
3. Item 3. The packaging material according to Item 1 or 2, further comprising a heat seal layer as an outermost layer.
4). Item 4. The packaging material according to any one of Items 1 to 3, wherein the base material layer contains an infrared reflective material.
5. Item 5. The packaging material according to any one of Items 1 to 4, wherein the content of aluminum flakes in the transparent infrared reflective layer is 0.1 to 5% by weight.
6). Item 6. The packaging material according to any one of Items 1 to 5, wherein the aluminum flakes have an average particle diameter of 3 to 80 µm and an aspect ratio of 2 to 100.
7). By irradiating the packaging material with light containing infrared light from the transparent infrared reflective layer toward the printed layer, the reflected light from the region irradiated with the light containing infrared light is reflected by the imaging means having sensitivity to infrared light. Item 7. The packaging material according to any one of Items 1 to 6, wherein the packaging material is used for foreign matter inspection for determining the presence or absence of foreign matter in the area from image data obtained by imaging.
8). The package which heat-sealed the container by using the packaging material in any one of said 1-7 as a cover material in the state with which the container was filled with the content.
9. Item 9. The package according to Item 8, wherein the content is a drug.
10. The imaging unit that irradiates the package body with light including infrared light from the transparent infrared reflection layer toward the printed layer, and reflects the reflected light from the region irradiated with the light including infrared light to the infrared light. Item 10. The package according to Item 8 or 9, wherein the package is used for a foreign substance inspection for determining the presence or absence of a foreign substance in the region from image data obtained by imaging.

  The packaging material and package of the present invention are composed of a laminate including a base material layer, a printing layer, and a transparent infrared reflective layer in this order, and the transparent infrared reflective layer has aluminum flakes dispersed in a transparent resin. Therefore, it can be suitably used for detecting foreign matter using infrared rays. That is, in the detection of foreign matter by infrared rays, when irradiating the packaging material with infrared rays so as to go from the transparent infrared reflection layer to the printing layer, the printing layer contains a large amount of white pigment such as titanium oxide, for example, white, light blue, Even if it shows a high brightness color such as pink, light green, etc., the infrared flakes are effectively reflected by the aluminum flakes, so there is no shadow of the printed layer in the reflected light and the result can be assimilated with the background It is possible to detect foreign matter (foreign matter that absorbs infrared rays such as dead bodies of insects and body hair) interposed between the packaging material (particularly the packaging material as a lid) and the container with high accuracy.

  In addition, in the case of using a pigment, such as naphthol AS, phthalocyanine blue, disazo yellow, etc., which has been conventionally suitable for foreign matter inspection using infrared rays, the configuration of the packaging material or package of the present invention is applied. Thus, for example, light colors such as light blue, light yellow, and pink or high brightness can be easily produced without degrading the accuracy of foreign matter inspection using infrared rays.

It is a figure which shows the structure of an example of the packaging material of this invention. It is a figure which shows the structure of an example of the package using the packaging material of this invention. It is a figure which shows the structure of another example of the package using the packaging material of this invention.

DESCRIPTION OF SYMBOLS 1 Base material layer 2 Printing layer 3 Transparent infrared reflection layer 4 Heat seal layer 5 Tablet (contents)
6 Container 7 Resin film layer

1. Packaging Material The packaging material of the present invention is composed of a laminate including a base material layer, a printing layer, and a transparent infrared reflective layer in this order, and the transparent infrared reflective layer has aluminum flakes dispersed in a transparent resin. It is characterized by becoming.

  In FIG. 1, the structure of an example of the packaging material of this invention is shown. As shown in FIG. 1, the packaging material of this invention may be comprised from the laminated body by which the printing layer 2 and the transparent infrared reflective layer 3 were laminated | stacked in order on the base material layer 1. As shown in FIG. In the transparent infrared reflective layer 3, aluminum flakes (flaked aluminum powder) are dispersed using a transparent resin as a matrix. In this case, when the infrared ray (infrared light) is irradiated from the direction of the arrow in FIG. 1, since the transparent infrared reflection layer 3 is formed in front of the printing layer 2, the aluminum flakes in the transparent infrared reflection layer 3 are formed. Can effectively reflect infrared rays. For this reason, even if the print layer is formed of a colorant that hardly transmits or does not transmit infrared rays, the region of the print layer 2 can maintain the same high brightness as that of the background when inspecting foreign matter using infrared rays. . As a result, a desired reflection effect can be obtained regardless of the type of pigment or the like used for forming the printing layer 2, and foreign matter detection using infrared rays can be performed with high accuracy.

(1) Layer structure of packaging material The packaging material of this invention is comprised from the laminated body which contains a base material layer, a printing layer, and a transparent infrared reflective layer in order as above-mentioned. As each layer, for example, the following can be suitably employed.

Base Material Layer As the base material layer, a known material can be adopted as long as it contains an infrared reflective material alone or at least an infrared reflective material. As an infrared reflective material, an aluminum foil, an aluminum vapor deposition resin film, etc. can be mentioned, for example. In addition, as long as the effects of the present invention are not impaired, for example, a laminate material in which a resin film, a primer layer, an anchor coat layer, a colored layer, an overcoat layer and the like are appropriately laminated on an infrared reflective material is employed as a base material layer. You can also.

  The material of the aluminum foil may be either aluminum or an aluminum-based alloy. Specifically, pure aluminum (JIS (AA) 1000 series, such as 1N30, 1070), Al-Mn series (JIS (AA) 3000 series, such as 3003, 3004 etc.), Al-Mg series (JIS (AA)) 5000 series), Al-Fe series (JIS (AA) 8000 series, such as 8021, 8079, etc.).

  The thickness of the aluminum foil is preferably 7 to 50 μm, more preferably 10 to 40 μm. By setting within this range, it is possible to obtain more excellent water resistance (moisture resistance), strength, handleability of the package, and the like. When an aluminum foil is used, it may be a hard material, a semi-hard material, a soft material, or the like, and may be appropriately selected according to the shape of the container, the type of contents, and the like. In addition, the aluminum foil can be molded, degreased / washed, anchor coated, overcoated, surface treated, and the like by a known method, if necessary. By using an aluminum foil, strength, barrier properties, storage stability, etc. as a packaging material can be effectively exhibited.

  Examples of the aluminum vapor deposited resin film include polyamide (nylon), polyethylene (particularly high-density polyethylene), polypropylene (particularly stretched polypropylene), vinyl chloride, ethylene-vinyl alcohol copolymer, polyethylene naphthalate, polyethylene terephthalate, and the like. The thing formed by vapor-depositing aluminum with a well-known vapor deposition method is illustrated. In this case, the thickness of the resin film is preferably about 9 to 50 μm.

  When the laminate material is used, examples of the resin film include polyamide (nylon), polyethylene (particularly high-density polyethylene), polypropylene (particularly stretched polypropylene), vinyl chloride, ethylene-vinyl alcohol copolymer, polyethylene naphthalate, A resin film such as polyethylene terephthalate can be applied. These can be used alone or in combination of two or more. Among these, at least one resin film of polyamide and polyester is preferable. In this case, the thickness of the resin film is preferably about 9 to 50 μm. By laminating resin films, it is possible to further improve strength, puncture resistance, water resistance, tear resistance, and the like.

  The lamination or adhesion method is not particularly limited, and a known method can be applied. For example, a dry lamination method using a two-component curable urethane adhesive such as polyester urethane or polyester, a co-extrusion method, an extrusion coating method, a thermal lamination method using an anchor coating agent, or the like can be given.

Print Layer The print layer in the packaging material of the present invention may be the same as that used in known packaging materials. The printing layer may be provided on both surfaces of the base material layer as necessary. Further, the printing layer may be a single layer or a multilayer composed of two or more layers.

  The printed layer contains at least one colorant composed of a pigment and a dye. Therefore, two or more colorants may be contained. These pigments and dyes are inorganic pigments (for example, barium sulfate, zinc white, titanium oxide, ultramarine blue, bitumen, talc, calcium carbonate, cobalt blue, red rose etc.), organic pigments (monoazo, condensed azo, anthraquinone, quinacridone) ), Isoindolinone, thioindigo, pyrrolopyrrole, perylene, disazo, phthalocyanine, etc.), as well as various dyes, etc., depending on, for example, the type of contents, packaging material, etc. You can choose.

  The color of the printing layer is not particularly limited, but it is possible to use high brightness colors (pastel colors, etc.) such as white, light blue, pink, light green, etc. This is one of the features of the present invention. That is, a white colorant such as titanium oxide (for example, a colorant having an infrared reflectance of 50% or less) can be used for the print layer.

  The content of the colorant in the printing layer is not particularly limited, but is preferably about 10 to 50% by weight, particularly about 15 to 40% by weight in the printing layer based on the solid content.

  The printing layer may contain a binder component (particularly a resin binder). Examples thereof include nitrocellulose, polyvinyl butyral, phenol resin, maleic acid resin, alkyd resin, chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer resin, and acrylic resin. These can be used alone or in combination of two or more.

The thickness of the print layer is not particularly limited, but is preferably about 0.1 to 10 μm. Moreover, it is preferable that the weight (weight after drying) of a printing layer shall be about 0.1-10 g / m < ² >.

  The formation method of a printing layer is not specifically limited, For example, a well-known printing method can be applied using the ink for forming a printing layer. As the ink, an ink containing a colorant may be used. More specifically, an ink containing a colorant and, if necessary, a binder component and / or a solvent can be used. As the colorant and the binder component, those described above can be used. Examples of the solvent that can be used include toluene, xylene, methyl ethyl ketone, isopropyl alcohol, thinner, ethyl acetate, methyl acetate, butyl cellosolve, butyl acetate, methanol, ethanol, butanol, hexane, and acetone.

  The printing method is not limited, and for example, relief printing, intaglio printing, screen printing, offset printing, gravure printing, and the like can be applied. Moreover, in this invention, after forming a printing layer, it can use for a drying process as needed. For example, it can be dried by setting the conditions at room temperature (20 ° C.) to about 250 ° C. for about 10 seconds to 10 hours. In the case of continuous drying, it may be designed so that it can be dried by blowing hot air or moved in an oven.

Transparent infrared reflective layer The transparent infrared reflective layer has aluminum flakes dispersed in a transparent resin. The transparency of the transparent infrared reflective layer is not particularly limited as long as the printed layer in the lower layer is visible. In addition, since aluminum flake itself is usually opaque, it is preferable to contain it so that it may not exceed 5 weight% in a transparent infrared reflective layer so that it may mention later.

  Aluminum flakes (flaked aluminum powder) are not particularly limited, and known or commercially available aluminum flakes can be employed. The material constituting the aluminum flakes may be not only pure aluminum but also an aluminum alloy.

  The average particle diameter of the aluminum flakes (according to the laser diffraction particle size distribution analyzer) is not limited, but is preferably about 3 to 80 μm. The aspect ratio (average particle diameter μm / thickness μm) of the aluminum flakes is preferably about 2 to 100. The thickness of the aluminum flake may be determined by observing and measuring the cross section of 20 aluminum flake particles with a scanning electron microscope.

  The aluminum flake content in the transparent infrared reflective layer is not limited, but is preferably 0.1 to 5% by weight. If it is less than 0.1% by weight, it is difficult to obtain the effects of the present invention (particularly, the effect of enabling infrared foreign matter inspection while maintaining almost white), and a high brightness color is realized without deteriorating the foreign matter inspection accuracy. There is a possibility that the effect of doing will not be obtained. On the other hand, if it exceeds 5% by weight, the gray color, which is the original color of aluminum, becomes too conspicuous, and the viscosity increases too much during the ink conversion before application, which may make it difficult to apply.

  The transparent resin used in the transparent infrared reflective layer is not particularly limited as long as it is substantially transparent. For example, nitrocellulose, polyvinyl butyral, phenol resin, maleic resin, alkyd resin, chlorinated polypropylene resin, vinyl chloride -A vinyl acetate copolymer resin, an acrylic resin, etc. can be mentioned. These can be used alone or in combination of two or more.

The thickness of the transparent infrared reflective layer is preferably about the same as that of the printed layer, and is preferably about 0.1 to 10 μm. The coating weight after drying is preferably about 0.1 to 10 g / m ² .

  The formation of the transparent infrared reflective layer can be suitably performed by a printing method using, for example, an ink containing a transparent resin and aluminum flakes. In this case, the selection of the solvent, the printing method, and the drying method can be carried out in the same manner as in the printing layer. Moreover, a transparent infrared reflective layer can be formed also by laminating | stacking the transparent infrared reflective film produced separately.

  The transparent infrared reflective layer may contain other components as long as the effects of the present invention are not hindered. Examples include dispersants, curing agents, anti-settling agents, softeners, antioxidants, extender pigments, UV absorbers, leveling agents, surface conditioners, sagging inhibitors, thickeners, antifoaming agents, lubricants, etc. May be.

Other Layers In the packaging material of the present invention, other layers may be included as necessary within the range not impairing the effects of the present invention. For example, known materials such as a heat seal layer, a resin film, a primer layer, an anchor coat layer, a key lacquer layer, an adhesive layer, and an overcoat layer (OP varnish) can be laminated. In particular, when the packaging material of the present invention is used as a lid material or the like, it is preferable to laminate a heat seal layer, a resin film, or the like.

  A known or commercially available material can be used as the heat seal layer. For example, high density polyethylene, medium density polyethylene, low density polyethylene, linear linear polyethylene, saturated polyester, linear saturated polyester, unstretched polypropylene, chlorinated polypropylene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer Polymer, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ionomer, ethylene-ethyl acrylate-maleic anhydride terpolymer, polyolefin, carboxylic acid-modified polyethylene, carboxylic acid-modified polypropylene, carboxylic acid-modified ethylene -Vinyl acetate, vinyl chloride, polystyrene and the like. Commercial products such as a product name “Bondaine” manufactured by Sumitomo Chemical Co., Ltd. and a product name “Mersen M” manufactured by Tosoh Corporation can also be used. These heat sealable resins can be used alone or in combination of two or more.

The heat seal layer can be formed by applying a liquid adhesive containing the resin or laminating a sealant film made of the resin. Although the thickness of the heat seal layer is not limited, it is usually preferably about 2 to 100 μm. In addition, what is necessary is just to make the application quantity after drying into about 2-15 g / m < ² >, when forming heat sealing resin (lacquer) by application | coating.

  Examples of the resin film include resin films such as polyamide (nylon), polyethylene (particularly high-density polyethylene), polypropylene (particularly stretched polypropylene), vinyl chloride, ethylene-vinyl alcohol copolymer, polyethylene naphthalate, polyethylene terephthalate, and the like. Can do. In this case, the thickness of the resin film is preferably about 9 to 50 μm.

(2) Use of packaging material The packaging material of the present invention can be used as it is or after being processed. As the processing method, the same method as in the case of a known packaging material can be adopted. For example, embossing, half-cutting, notching and the like may be performed within a range that does not hinder the effects of the present invention. The packaging material of the present invention can be suitably used not only for lid materials but also for bags such as molded containers, wrapping paper, trays, tubes, and bags and pouches.

  When the packaging material of the present invention is used as a cover material for a press-through pack, as shown in FIG. 2, a base material layer (aluminum foil or the like), a printing layer, a transparent infrared reflective layer, and a heat seal layer are laminated in this order. Can be used. On the other hand, if there is no need for press-through, a structure in which a resin film, a transparent infrared reflection layer, a printing layer, a base material layer, and a heat seal layer are sequentially laminated as shown in FIG. 3 may be employed. As the resin film in the latter case, the same resin film as described for the base material layer can be adopted.

  The packaging material of the present invention can be used for foreign matter inspection using infrared rays (also simply referred to as “foreign matter inspection”). More specifically, the packaging material is irradiated with light containing infrared light from the transparent infrared reflective layer toward the printed layer, and the reflected light from the region irradiated with light containing infrared light is converted into infrared light. It can be used for foreign object inspection in which an image is picked up by an imaging means having sensitivity, and the presence or absence of a foreign substance in the region is determined from image image data obtained by imaging. As such foreign matter inspection method and foreign matter inspection apparatus, known or commercially available ones can be adopted. For example, as shown in Examples described later, “Flash Patri VRS600 (manufactured by CKD)” manufactured by CKD Corporation can be suitably used.

  Therefore, it is preferable to reflect near infrared rays 50% or more in the area | region where the aluminum flakes of the packaging material of this invention were laminated | stacked. In this region, it is more preferable to reflect near infrared rays having a wavelength of 800 to 900 nm by 50% or more (particularly 60% or more). By having such infrared reflection characteristics, it is possible to achieve better foreign object detection accuracy. Note that the reflectance of near infrared rays can be obtained by measuring the reflectance (%) when the region is irradiated with near infrared rays having wavelengths of 800 nm, 825 nm, 850 nm, 875 nm, and 900 nm, and obtaining an average value thereof. . As the reflectance measuring apparatus, an ultraviolet-visible near-infrared spectrophotometer (product name “JASCO, V570 type” manufactured by JASCO Corporation) can be used. The specifications in that case are an integrating sphere type (detecting regular reflection light and diffuse reflection light), integrating sphere inner diameter: 60 mm, and integrating sphere inner wall coating agent: barium sulfate.

2. Package Body The present invention includes a package body heat-sealed in a container using the packaging material as a lid material in a state where the container is filled with contents. For example, as a packaging material of the present invention, a packaging material comprising a base material layer, a printing layer, a transparent infrared reflective layer, and a heat seal layer is used as a cover material, and a transparent, translucent or opaque container is filled with the contents A package can be suitably obtained by heat-sealing the heat-sealing layer of the lid and the container opening.

  The packaging body of the present invention can also be subjected to foreign matter inspection using infrared rays, like the packaging material. More specifically, the packaging material is irradiated with light containing infrared light from the transparent infrared reflective layer toward the printed layer, and the reflected light from the region irradiated with light containing infrared light is converted into infrared light. It can be used for foreign object inspection in which an image is picked up by an imaging means having sensitivity, and the presence or absence of a foreign substance in the region is determined from image image data obtained by imaging. As such foreign matter inspection method and foreign matter inspection apparatus, known or commercially available ones can be adopted. For example, as shown in Examples described later, “Flash Patri VRS600 (manufactured by CKD)” manufactured by CKD Corporation can be suitably used.

  The material of the container is not limited, and can be appropriately selected according to the foreign substance inspection mode and the like. For example, when a transparent or translucent container is required (that is, when foreign matter inspection is performed from the container side of the package), a container made of a material such as polypropylene or vinyl chloride can be suitably used. In addition, for example, when the container material is not required to be transparent or translucent (that is, it is necessary to inspect the foreign material from the lid side of the package and the foreign material inspection on the container side is not required), the container is accommodated. An aluminum foil having a molded part or a laminate thereof can be used as a container. In addition, what is necessary is just to employ | adopt a layer structure as shown in FIG. 3, when inspecting a foreign material from the cover material side of a package.

  When using a container formed of a resin film, the thickness of the resin film is not limited, but is preferably about 0.05 to 2 mm. When using aluminum foil or its laminated body, it is preferable that the thickness shall be about 40-200 micrometers.

  The container can be formed by, for example, a method using a press machine (extrusion molding, deep drawing molding, etc.) or a method not using a press machine (vacuum molding, pressure forming, etc.). These moldings may be either cold molding or hot molding, or a combination of both.

  The heat sealing conditions are not particularly limited, and can be appropriately changed depending on the type of the thermal adhesive to be used, the type of contents, and the like. Generally, it may be about 140 to 260 ° C. for about 1 to 3 seconds.

  Further, the contents loaded in the container of the present invention package are not particularly limited, and the contents filled and loaded in a known PTP package or blister pack can be applied as they are. The properties of the contents are not limited, and any of solids (solids) and liquids may be used, but solids are particularly desirable. Examples thereof include drugs (medicines), foods, electronic parts, contact lenses, fragrances, and cleaning agents. In particular, it is suitable for drugs that require foreign matter inspection. The drug dosage form may be, for example, a tablet or a capsule.

  The features of the present invention will be described more specifically with reference to the following examples and comparative examples. However, the scope of the present invention is not limited to the examples.

Example 1
On the matte surface of 20 μm thick aluminum foil (1N30 soft foil), using a bar coater, dry white ink (titanium oxide pigment solid content 43% by weight) after solid printing at a coating amount of 1.5 g / m ² ( Full surface printing) and dried. Subsequently, aluminum flakes (“1200N” manufactured by Toyo Aluminum Co., Ltd., particle size distribution D10 / D50 / D90: 3 μm / 12 μm / 28 μm) were added to a solvent (volume ratio of toluene / isopropyl alcohol / ethyl acetate = 30) in a nitrocellulose resin. 20:50 mixed solvent) (1 wt% dispersion based on solid content) was dried with a bar coater and then coated on the white printed layer at a coating amount of 1 g / m ² and dried. . Further, as a heat seal layer, a polypropylene-based thermal adhesive was dried by a bar coater and then applied onto the entire surface of the aluminum flake-containing layer at a coating amount of 3.5 g / m ² and dried. In this way, a packaging material consisting of “aluminum foil (base material) / white printed layer / aluminum flake-containing layer (transparent infrared reflective layer) / heat seal layer” was obtained.

Example 2
A packaging material was obtained in the same manner as in Example 1 except that “7620NS” (particle size distribution D10 / D50 / D90: 7 μm / 18 μm / 31 μm) manufactured by Toyo Aluminum Co., Ltd. was used as the aluminum flake.

Example 3
A packaging material was obtained in the same manner as in Example 1 except that “MS-750” (particle size distribution D10 / D50 / D90: 5 μm / 10 μm / 20 μm) manufactured by Toyo Aluminum Co., Ltd. was used as the aluminum flake.

Example 4
A packaging material was obtained in the same manner as in Example 1 except that “0803M” (particle size distribution D10 / D50 / D90: 3 μm / 6 μm / 10 μm) manufactured by Toyo Aluminum Co., Ltd. was used as the aluminum flake.

Comparative Example 1
A packaging material was obtained in the same manner as in Example 1 except that the aluminum flake-containing layer was not formed in Example 1.

Example 5
A packaging material was obtained in the same manner as in Example 1 except that indigo ink (phthalocyanine blue pigment-containing solid content 27% by weight) was used instead of white ink (containing titanium oxide pigment) in the white printing layer.

Example 6
A packaging material was obtained in the same manner as in Example 2 except that indigo ink (phthalocyanine blue pigment-containing solid content 27% by weight) was used instead of white ink (containing titanium oxide pigment) in the white printing layer.

Example 7
A packaging material was obtained in the same manner as in Example 3 except that indigo ink (phthalocyanine blue pigment-containing solid content 27% by weight) was used instead of white ink (containing titanium oxide pigment) in the white printing layer.

Example 8
A packaging material was obtained in the same manner as in Example 4 except that indigo ink (phthalocyanine blue pigment-containing solid content 27% by weight) was used instead of white ink (containing titanium oxide pigment) in the white printing layer.

Comparative Example 2
White ink (titanium oxide pigment solid content 43 wt%) and indigo ink (phthalocyanine blue pigment containing solid content 27 wt%) (mixing weight ratio of white ink and indigo ink = 1: 3) A packaging material was obtained in the same manner as in Example 1 except that the aluminum flake-containing layer was not formed.

Test example 1
Using the packaging material of each Example and Comparative Example as a lid (heat seal layer is on the container side), heat sealing at 180 ° C. for 3 seconds is applied to a PTP container obtained by molding a transparent polypropylene film with a thickness of 300 μm. The package was obtained. Between each lid and the container, hair having a length of about 2 cm was interposed as a foreign substance.

<Foreign matter inspection results using infrared rays>
Foreign matter inspection was performed by irradiating infrared rays from the container side of each package. As the inspection device, “Flash Patri VRS600” manufactured by CKD Corporation was used. First, Table 1 shows the luminance values and determination results (determination criteria are according to Table 2) for the region free of foreign matter. If the luminance value is 225 or more and the determination criterion is ◯ or ◎, it indicates that the foreign object can be detected well if there is a foreign object (foreign substance that absorbs infrared rays) in that region. Next, Table 1 shows the determination result (foreign matter determination) of the apparatus for a region with foreign matter (hair).

<Visual observation of appearance color>
The color of each package on the container side was visually observed under a fluorescent lamp. The results are shown in Table 1.

  Since the package (packaging material) of the present invention has a high luminance value, if there is a foreign substance in that region, the luminance value becomes extremely low (that is, it absorbs infrared rays), so the presence of the foreign substance is easy. Can be determined. Since the package (packaging material) of the comparative example has a low luminance value, the luminance value hardly changes even if a foreign substance exists in the region, and it is difficult to determine the presence of the foreign substance. The packaging body (packaging material) of the present invention can bring out a whitish appearance or a light color with high brightness without substantially reducing the accuracy of foreign object inspection.

Claims (10)

A packaging material comprising a laminate comprising a base material layer, a printing layer and a transparent infrared reflective layer in this order, wherein the transparent infrared reflective layer comprises aluminum flakes dispersed in a transparent resin. The packaging material according to claim 1, further comprising a resin film layer on the transparent infrared reflective layer. The packaging material according to claim 1, further comprising a heat seal layer as an outermost layer. The packaging material in any one of Claims 1-3 in which a base material layer contains an infrared reflective material. The packaging material in any one of Claims 1-4 whose content of the aluminum flakes in a transparent infrared rays reflection layer is 0.1 to 5 weight%. The packaging material according to any one of claims 1 to 5, wherein the aluminum flakes have an average particle diameter of 3 to 80 µm and an aspect ratio of 2 to 100. By irradiating the packaging material with light containing infrared light from the transparent infrared reflective layer toward the printed layer, the reflected light from the region irradiated with the light containing infrared light is reflected by the imaging means having sensitivity to infrared light. The packaging material according to any one of claims 1 to 6, wherein the packaging material is used for foreign matter inspection for determining the presence or absence of foreign matter in the area from image data obtained by imaging. The package which heat-sealed the container with the packaging material in any one of Claims 1-7 in the state with which the container was filled with the content. The package according to claim 8, wherein the content is a drug. The imaging unit that irradiates the package body with light including infrared light from the transparent infrared reflection layer toward the printed layer, and reflects the reflected light from the region irradiated with the light including infrared light to the infrared light. The package according to claim 8 or 9, wherein the package is used for foreign substance inspection for determining whether or not there is a foreign substance in the region from image data obtained by imaging.