JP3732504B1 - Aluminum foil for packaging, printed with a display with excellent infrared transparency - Google Patents

Aluminum foil for packaging, printed with a display with excellent infrared transparency Download PDF

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JP3732504B1
JP3732504B1 JP2005019092A JP2005019092A JP3732504B1 JP 3732504 B1 JP3732504 B1 JP 3732504B1 JP 2005019092 A JP2005019092 A JP 2005019092A JP 2005019092 A JP2005019092 A JP 2005019092A JP 3732504 B1 JP3732504 B1 JP 3732504B1
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aluminum foil
white pigment
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JP2006205479A (en
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宏 西尾
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Nippon Foil Manufacturing Co Ltd
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Abstract


【課題】 表示が印刷されてなる包装用アルミニウム箔において、表示下のアルミニウム箔本体に傷などの欠陥が存在するか否かを容易に検査しでき、しかも、可視光線を透過しやすい有色顔料を用いて印刷した表示であっても、その表示が読みやすい包装用アルミニウム箔を提供する。
【解決手段】 この包装用アルミニウム箔は、アルミニウム箔本体表面に、文字や図柄などの表示が印刷されている。この表示は、有色顔料及び白色顔料を含む印刷インキを用いて印刷されたものである。白色顔料は、白色顔料本体表面が合成樹脂膜によって被覆されている。白色顔料本体は二酸化チタンである。白色顔料本体の多くは、その一次粒子径の大きさが20〜50nmである。この印刷インキで印刷された表示は、赤外線透過性に優れていると共に、白色顔料によって可視光線をよく反射する。
【選択図】 なし

PROBLEM TO BE SOLVED: To provide a colored pigment which can easily inspect whether or not a defect such as a flaw exists in an aluminum foil body under display in a packaging aluminum foil on which a display is printed, and which easily transmits visible light. Provided is an aluminum foil for packaging that is easy to read even if it is a printed display.
SOLUTION: This packaging aluminum foil has characters, designs and the like printed on the surface of the aluminum foil body. This display is printed using a printing ink containing a colored pigment and a white pigment. The white pigment main body surface is covered with a synthetic resin film. The white pigment body is titanium dioxide. Many of the white pigment bodies have a primary particle size of 20 to 50 nm. The display printed with this printing ink is excellent in infrared transparency and reflects visible light well with a white pigment.
[Selection figure] None

Description

本発明は、アルミニウム箔本体表面に文字や図柄などの表示が印刷されてなる包装用アルミニウム箔製包装体に関し、特に、表示部が良好な赤外線透過性を持つ包装用アルミニウム箔に関するものである。また、この包装用アルミニウム箔を用いたアルミニウム箔製包装体に関するものである。   The present invention relates to an aluminum foil packaging body for packaging in which characters, designs, and the like are printed on the surface of an aluminum foil main body, and more particularly to an aluminum foil for packaging whose display portion has good infrared transmittance. The present invention also relates to an aluminum foil package using the packaging aluminum foil.

医薬品、化粧品又は食品の包装には、種々の形態のアルミニウム箔製包装体が用いられている。具体的には、医薬品や化粧品の包装には、プレススルーパックやピールタイプなどのブリスターパックからなるアルミニウム箔製包装体が常用されている。たとえば、ブリスターパックの一種であるプレススルーパックは、錠剤を収納しうるポケット部を多数有する合成樹脂製の容器本体と、ポケット部の口を塞ぐアルミニウム箔製蓋材とよりなるものである。そして、蓋材を構成しているアルミニウム箔には、その本体表面に、医薬品の商標、品番、製造会社名又は図柄などの表示が印刷されている。   Various forms of aluminum foil packages are used for packaging pharmaceuticals, cosmetics or foods. Specifically, aluminum foil packages made of blister packs such as press-through packs and peel types are commonly used for packaging pharmaceuticals and cosmetics. For example, a press-through pack, which is a kind of blister pack, comprises a container body made of a synthetic resin having a large number of pockets that can store tablets, and an aluminum foil lid that closes the mouth of the pockets. And the aluminum foil which comprises the cover material is printed on the surface of the main body with a display such as a trademark, product number, manufacturer name or design of the pharmaceutical product.

プレススルーパックなどのアルミニウム箔製包装体は、医薬品などを密封するために用いられるものであるから、包装体に傷、亀裂、孔又は異物などが存在することは商品欠陥となる。アルミニウム箔本体に傷などの欠陥が存在するか否かは、光学的な検査を行えば、直ちに判明する。すなわち、アルミニウム箔本体に赤外線を照射して撮像し、画像処理すれば、傷、亀裂、孔又は異物などの欠陥が存在するか否かは、直ちに判明する。したがって、傷などの欠陥が存在するアルミニウム箔本体は、不良品として排除すれば、欠陥の無いアルミニウム箔本体を安定して提供することができる。   Since an aluminum foil package such as a press-through pack is used to seal pharmaceuticals or the like, the presence of scratches, cracks, holes, foreign matters, etc. in the package is a product defect. Whether or not there is a defect such as a flaw in the aluminum foil body can be immediately determined by optical inspection. That is, if an image is processed by irradiating an aluminum foil body with infrared rays, whether or not there is a defect such as a scratch, a crack, a hole, or a foreign object is immediately determined. Therefore, if an aluminum foil main body having defects such as scratches is excluded as a defective product, an aluminum foil main body having no defects can be stably provided.

しかしながら、アルミニウム箔本体に傷などの欠陥が存在しなくても、このアルミニウム箔本体表面に文字などの表示を印刷し、アルミニウム箔製包装体を得る段階において、傷、亀裂、孔又は異物などの欠陥が生じることがある。具体的には、アルミニウム箔本体に、文字や図柄などの表示を印刷する段階で、傷などの欠陥が生じることもある。また印刷後に、貼合や熱接着などの各種加工を行う段階で、傷などの欠陥が生じることもある。したがって、各段階はもとより、最終品である包装体を作成した後においても、印刷が施されたアルミニウム箔本体、つまりアルミニウム箔に傷などの欠陥が存在するか否かを検査する方法が切望されていた。   However, even if there are no defects such as scratches on the aluminum foil body, characters, etc. are printed on the surface of the aluminum foil body to obtain scratches, cracks, holes, foreign objects, etc. Defects may occur. Specifically, defects such as scratches may occur at the stage of printing characters, designs, etc. on the aluminum foil body. In addition, after printing, defects such as scratches may occur at various stages such as pasting and thermal bonding. Therefore, not only at each stage, but also after creating the final package, there is an urgent need for a method for inspecting whether the printed aluminum foil body, that is, the aluminum foil has defects such as scratches. It was.

このような段階で、アルミニウム箔に傷などの欠陥が存在するか否かを検査する場合、アルミニウム箔本体に印刷された各種表示が、検査の障害となることがあった。すなわち、印刷されたアルミニウム箔に赤外線を照射しても、印刷された各種表示が赤外線を反射し、アルミニウム箔本体に赤外線が照射されず、アルミニウム箔本体に傷などの欠陥が存在するか否かが不明となるのである。つまり、表示が印刷された部位におけるアルミニウム箔本体に、傷などの欠陥が存在するか否かが不明になるという問題点があった。   In such a stage, when inspecting whether there is a defect such as a scratch on the aluminum foil, various displays printed on the aluminum foil body may be an obstacle to the inspection. In other words, even if the printed aluminum foil is irradiated with infrared rays, the printed various displays reflect the infrared rays, the aluminum foil body is not irradiated with infrared rays, and there are defects such as scratches on the aluminum foil body. Is unknown. That is, there is a problem that it is unclear whether or not there is a defect such as a scratch in the aluminum foil main body at the portion where the display is printed.

このような問題点は、印刷された各種表示の種類によって頻繁に生じることもあり、また、殆ど生じないこともあった。一般的には、白色顔料又は黒色顔料を使用すると、このような問題点が頻繁に生じ、有色顔料を使用すると、このような問題点は殆ど生じないとの知見を、本発明者は得ている。   Such a problem may frequently occur depending on the type of various printed displays, or may hardly occur. In general, the present inventor has found that such a problem frequently occurs when a white pigment or a black pigment is used, and that such a problem hardly occurs when a colored pigment is used. Yes.

このため、本発明者は、赤外線を透過しやすい白色顔料を用いて印刷された包装用アルミニウム箔(特許文献1)、及び赤外線を透過しやすい黒色顔料を用いて印刷された包装用アルミニウム箔(特許文献2)を提案している。   For this reason, the inventor has disclosed a packaging aluminum foil (Patent Document 1) printed using a white pigment that easily transmits infrared rays, and a packaging aluminum foil printed using a black pigment that easily transmits infrared rays ( Patent Document 2) is proposed.

特願2003−372725(特許請求の範囲)Japanese Patent Application No. 2003-372725 (Claims) 特願2003−372726(特許請求の範囲)Japanese Patent Application No. 2003-372726 (Claims)

上記したように、有色顔料を使用して、アルミニウム箔に印刷すると、その印刷された表示は赤外線を透過しやすいと同時に、可視光線をも透過しやすいということがあった。したがって、有色顔料で印刷された表示部において、アルミニウム箔の地色が反射し、表示が読みにくいという欠点があった。この欠点を解消するためには、特許文献1で提案された発明を適用し、有色顔料に特定の白色顔料を混合するか、又は下層(アルミニウム箔本体に直接当接する層)に特定の白色顔料からなる層を設ければよい。これによって、赤外線は透過するけれども、可視光線は白色顔料によって反射され、アルミニウム箔まで至らずに、その地色が反射して表示が読みにくくなるのを防止しうるのである。   As described above, when a colored pigment is used and printed on an aluminum foil, the printed display is likely to transmit infrared rays as well as visible light. Therefore, in the display part printed with the colored pigment, the ground color of the aluminum foil is reflected, and the display is difficult to read. In order to eliminate this drawback, the invention proposed in Patent Document 1 is applied, and a specific white pigment is mixed with a colored pigment, or a specific white pigment is formed in a lower layer (a layer directly contacting the aluminum foil body) A layer made of may be provided. In this way, although infrared rays are transmitted, visible light is reflected by the white pigment, so that it can be prevented that the background color is reflected and the display becomes difficult to read without reaching the aluminum foil.

以上のようにして、本発明者は特許文献1に係る発明を適用して実験を行っていたところ、特許文献1に係る発明で用いられる白色顔料の中でも、特別な白色顔料と有色顔料とを混合して用いれば、有色顔料の反射波長の領域で、光線の透過率が急激に高くなることを見出した。そして、赤外線の領域では、特に高い透過率を維持することも見出した。本発明は、このような知見に基づいてなされたものである。   As described above, the inventor conducted an experiment by applying the invention according to Patent Document 1, and among the white pigments used in the invention according to Patent Document 1, a special white pigment and a colored pigment were used. It has been found that the light transmittance rapidly increases in the region of the reflection wavelength of the colored pigment when used in combination. It was also found that particularly high transmittance is maintained in the infrared region. The present invention has been made based on such knowledge.

すなわち、本発明は、アルミニウム箔本体表面に、文字や図柄などの表示を印刷してなる包装用アルミニウム箔において、前記表示は、有色顔料及び白色顔料を含む印刷インキを用いて印刷することによって形成されたものであり、該白色顔料は、白色顔料本体表面が合成樹脂膜によって被覆されており、該白色顔料本体は二酸化チタンであって、その一次粒子径の大きさは20〜50nmのものが主体であることを特徴とする赤外線透過性に優れた表示を印刷してなる包装用アルミニウム箔に関するものである。   That is, the present invention relates to an aluminum foil for packaging formed by printing a display such as characters and designs on the surface of an aluminum foil body, and the display is formed by printing using a printing ink containing a colored pigment and a white pigment. In the white pigment, the surface of the white pigment main body is covered with a synthetic resin film, the white pigment main body is titanium dioxide, and the primary particle diameter is 20 to 50 nm. The present invention relates to an aluminum foil for packaging formed by printing a display excellent in infrared transparency, which is a main component.

本発明に係る包装用アルミニウム箔には、文字や図柄などの表示が施されている。すなわち、アルミニウム箔本体表面に、印刷インキを用いて、文字や図柄などの表示を印刷してなるアルミニウム箔が用いられる。アルミニウム箔本体表面とは、アルミニウム箔の表裏面の表面を意味しており、裏表のいずれに表示が印刷されていてもよい。   The packaging aluminum foil according to the present invention is provided with characters, designs, and the like. That is, an aluminum foil is used that is printed on the surface of the aluminum foil body using characters such as printing ink. The surface of the aluminum foil main body means the front and back surfaces of the aluminum foil, and the display may be printed on either side.

印刷インキには、有色顔料及び白色顔料が含有されている。有色顔料は1種のみを用いてもよいし、2種以上を用いてもよい。有色顔料と白色顔料を混合するには、樹脂ワニス中に両顔料を添加・混合すればよい。また、有色顔料を含有する樹脂ワニスと、白色顔料を含有する樹脂ワニスとを混合してもよい。有色顔料と白色顔料の配合比は任意である。一般的に、淡色にしたいときは白色顔料が多くなり、濃色にしたいときは白色顔料は少なくなる。   The printing ink contains a colored pigment and a white pigment. Only one color pigment may be used, or two or more color pigments may be used. In order to mix the colored pigment and the white pigment, both pigments may be added and mixed in the resin varnish. Moreover, you may mix the resin varnish containing a colored pigment, and the resin varnish containing a white pigment. The mixing ratio of the colored pigment and the white pigment is arbitrary. In general, when a light color is desired, the amount of white pigment increases, and when a dark color is desired, the amount of white pigment decreases.

有色顔料としては、従来公知のものが用いられる。特に、色の三原色である赤色顔料、青色顔料、黄色顔料が用いられる。これらの三原色を適宜混合することによって、所望の色相を持つ色を得ることができる。赤色顔料としては、公知のアゾ系顔料等が用いられる。青色顔料としては、公知のフタロシアニン系顔料等が用いられる。黄色顔料としては、公知のジスアゾ系顔料等が用いられる。緑色顔料等のその他の色相の顔料としても、公知のフタロシアニン系やジスアゾ系等の顔料が用いられる。なお、本発明において、有色顔料というのは、各種顔料中から白色顔料及び黒色顔料を除いたものを意味している。   A conventionally well-known thing is used as a colored pigment. In particular, a red pigment, a blue pigment, and a yellow pigment, which are the three primary colors, are used. By appropriately mixing these three primary colors, a color having a desired hue can be obtained. As the red pigment, a known azo pigment or the like is used. As the blue pigment, known phthalocyanine pigments and the like are used. A known disazo pigment or the like is used as the yellow pigment. As pigments of other hues such as green pigments, known phthalocyanine-based and disazo-based pigments are used. In the present invention, the colored pigment means one obtained by removing the white pigment and the black pigment from various pigments.

本発明で用いる白色顔料は、白色顔料本体と、この本体表面に被覆された合成樹脂膜とよりなる。白色顔料本体としては、二酸化チタンが用いられる。二酸化チタンには、ルチル型とアナターゼ型とが存在するが、本発明においては、いずれを用いてもよい。一般的には、光触媒作用の低いルチル型を用いる方が好ましい。   The white pigment used in the present invention comprises a white pigment main body and a synthetic resin film coated on the surface of the main body. Titanium dioxide is used as the white pigment body. Titanium dioxide has a rutile type and an anatase type, and any of them may be used in the present invention. In general, it is preferable to use a rutile type having a low photocatalytic action.

また、白色顔料本体の多くは、20〜50nmの一次粒子径を持つものである。白色顔料本体の多くが、50nmを超える一次粒子径を持つものであると、有色顔料の反射波長領域での光線透過率が急激に変化せず、また近赤外線を含む赤外線領域での光線透過率が顕著に高くならないので、好ましくない。なお、20nm未満の一次粒子径を持つ白色顔料本体は、合理的に製造しにくく実用的ではない。ここで、白色顔料本体の一次粒子径は、走査型電子顕微鏡(株式会社日立製作所製「S−2100B」)を用いて測定されるものである。   Many of the white pigment bodies have a primary particle diameter of 20 to 50 nm. If most of the white pigment body has a primary particle diameter exceeding 50 nm, the light transmittance in the reflection wavelength region of the colored pigment does not change abruptly, and the light transmittance in the infrared region including near infrared rays. Is not preferred because it does not increase significantly. A white pigment body having a primary particle size of less than 20 nm is not practical and difficult to produce. Here, the primary particle diameter of the white pigment main body is measured using a scanning electron microscope (“S-2100B” manufactured by Hitachi, Ltd.).

白色顔料本体表面には合成樹脂膜が被覆されている。合成樹脂膜で被覆することにより、白色顔料が凝集しにくくなり、分散性が良好となるので、赤外線も透過しやすくなると考えられる。また、合成樹脂膜で被覆することにより、白色顔料は赤外線を透過しやすくなる。この作用については定かではないが、合成樹脂膜が赤外線を透過しやすいからであると考えられる。すなわち、空気中から直接白色顔料本体に赤外線が照射される場合に比べて、合成樹脂膜を介して赤外線が照射される方が、赤外線の照射角度が合成樹脂膜で屈折し、白色顔料本体を透過しやすくなるのではないかと考えられるのである。合成樹脂膜を形成している合成樹脂としては、任意の合成樹脂を用いることができるが、具体的には、酢酸ビニル樹脂、塩化ビニル樹脂、酢酸ビニル−塩化ビニル共重合体樹脂などを使用するのが好ましい。   The surface of the white pigment body is covered with a synthetic resin film. By covering with the synthetic resin film, the white pigment is less likely to aggregate and the dispersibility is improved, so that it is considered that infrared rays are easily transmitted. Further, by covering with a synthetic resin film, the white pigment easily transmits infrared rays. Although it is not certain about this action, it is considered that the synthetic resin film easily transmits infrared rays. In other words, compared to the case where the white pigment body is directly irradiated with infrared light from the air, the infrared radiation angle is refracted by the synthetic resin film when the infrared light is irradiated through the synthetic resin film. It is thought that it becomes easy to penetrate. As the synthetic resin forming the synthetic resin film, any synthetic resin can be used. Specifically, vinyl acetate resin, vinyl chloride resin, vinyl acetate-vinyl chloride copolymer resin, etc. are used. Is preferred.

白色顔料本体表面を合成樹脂膜で被覆するには、加熱溶融させた酢酸ビニル−塩化ビニル共重合体などの合成樹脂に、白色顔料本体を分散させ、その後、合成樹脂を冷却固化すればよい。また、エステル類やケトン類などの溶剤に合成樹脂を溶解させ、ここに白色顔料本体を分散させ、その後、溶剤を乾燥除去すればよい。白色顔料本体と合成樹脂膜との重量比は任意ではあるが、概ね、白色顔料本体:合成樹脂膜=80〜60:20〜40であるのが好ましい。   In order to coat the surface of the white pigment main body with a synthetic resin film, the white pigment main body is dispersed in a synthetic resin such as a vinyl acetate-vinyl chloride copolymer that has been heated and melted, and then the synthetic resin is cooled and solidified. Further, the synthetic resin is dissolved in a solvent such as esters and ketones, the white pigment main body is dispersed therein, and then the solvent is dried and removed. Although the weight ratio of the white pigment main body and the synthetic resin film is arbitrary, it is generally preferable that the white pigment main body: synthetic resin film = 80-60: 20-40.

印刷インキに含有されている樹脂ワニスは、樹脂を溶剤に溶解させたものである。樹脂ワニスに用いられる樹脂としては、従来公知の任意の樹脂を用いうるが、特に酢酸ビニル系重合体、塩化ビニル系重合体又は酢酸ビニル−塩化ビニル系共重合体などを用いるのが好ましい。また、溶剤としても、従来公知の各種有機溶剤を用いうるが、特にケトン類などを用いるのが好ましい。印刷インキを構成している白色顔料と樹脂ワニス中の樹脂との重量比は、任意ではあるが、概ね等量であるか又は白色顔料が若干少ない方が好ましい。また、樹脂ワニス中の溶剤は、所望の粘度となるよう適宜配合される。   The resin varnish contained in the printing ink is obtained by dissolving a resin in a solvent. As the resin used for the resin varnish, any conventionally known resin can be used, and it is particularly preferable to use a vinyl acetate polymer, a vinyl chloride polymer, a vinyl acetate-vinyl chloride copolymer, or the like. As the solvent, various conventionally known organic solvents can be used, but it is particularly preferable to use ketones. The weight ratio of the white pigment constituting the printing ink to the resin in the resin varnish is arbitrary, but is preferably approximately equal or slightly less white pigment. The solvent in the resin varnish is appropriately blended so as to have a desired viscosity.

本発明に係る包装用アルミニウム箔は、上記した印刷インキによって、アルミニウム箔本体に文字や図柄などの表示が印刷されてなるものである。したがって、このような包装用アルミニウム箔において、アルミニウム箔本体に施された表示は、有色顔料と特別な白色顔料と樹脂とで形成されていることになる。そして、有色顔料と特別な白色顔料との共存によって、当該有色顔料の反射波長の領域で光線透過率が急激に変化すると共に、近赤外線を含む赤外線領域で十分に高い光線透過率を維持するのである。よって、本発明に係る包装用アルミニウム箔は、表示が施された状態でも、赤外線の照射によって、表示下のアルミニウム箔本体に傷などの欠陥が有るか否かを検査することができる。   The aluminum foil for packaging according to the present invention is such that characters, designs, etc. are printed on the aluminum foil main body with the above-described printing ink. Therefore, in such packaging aluminum foil, the indication given to the aluminum foil main body is formed of a colored pigment, a special white pigment, and a resin. The coexistence of the colored pigment and the special white pigment changes the light transmittance rapidly in the reflection wavelength region of the colored pigment and maintains a sufficiently high light transmittance in the infrared region including near infrared rays. is there. Therefore, the aluminum foil for packaging which concerns on this invention can test | inspect whether the aluminum foil main body under display has defects, such as a damage | wound, by irradiation of infrared rays, even in the state where the display was given.

また、本発明に係るアルミニウム箔製包装体は、少なくともその一部に、前記した包装用アルミニウム箔が用いられてなるものである。たとえば、アルミニウム箔製包装体がプレススルーパックなどのブリスターパックである場合には、合成樹脂製の容器本体の蓋材として、前記したアルミニウム箔が用いられる。したがって、プレススルーパックなどのブリスターパックからなるアルミニウム箔製包装体の製造段階の任意の段階で、アルミニウム箔に赤外線を照射すれば、表示下のアルミニウム箔本体に傷などの欠陥が有るか否かを検査することができる。   Moreover, the aluminum foil packaging body according to the present invention is formed by using the packaging aluminum foil described above at least in part. For example, when the aluminum foil package is a blister pack such as a press-through pack, the above-described aluminum foil is used as a cover material for a synthetic resin container body. Therefore, if the aluminum foil is irradiated with infrared rays at any stage of the production stage of the aluminum foil package consisting of a blister pack such as a press-through pack, whether the aluminum foil body under the display has defects such as scratches. Can be inspected.

本発明に係る包装用アルミニウム箔において、アルミニウム箔本体表面に施された表示は、有色顔料と特別な白色顔料とによって、有色に着色されているため、ここに赤外線を照射した場合、赤外線をよく透過し、着色下のアルミニウム箔本体面もよく照射される。すなわち、照射して撮像し画像処理する際、表示は無視された状態となる。したがって、表示下におけるアルミニウム箔本体に傷、亀裂、孔又は異物などの欠陥が存在するか否かを検査することが可能となる。また、本発明によれば、有色顔料の反射波長の領域で、その光線透過率が急激に変化する。つまり、有色顔料の反射波長を越えた波長の光線を、急激に透過しやすくなる。したがって、赤外線として近赤外線を使用した場合でも、良好に前記した検査を行うことが可能となる。   In the aluminum foil for packaging according to the present invention, the indication given on the surface of the aluminum foil main body is colored with a colored pigment and a special white pigment. The aluminum foil body surface that is transmitted and colored is well irradiated. That is, the display is ignored when the image is processed by irradiation. Therefore, it is possible to inspect whether or not there is a defect such as a scratch, a crack, a hole, or a foreign object in the aluminum foil body under display. Further, according to the present invention, the light transmittance changes rapidly in the region of the reflection wavelength of the colored pigment. That is, it becomes easy to rapidly transmit light having a wavelength exceeding the reflection wavelength of the colored pigment. Therefore, even when near infrared rays are used as infrared rays, the above-described inspection can be performed satisfactorily.

一方、本発明に係る包装用アルミニウム箔は、有色顔料と特別な白色顔料で有色に着色されているため、当該有色の反射波長の可視光線は有色顔料によって反射されると共に、白色顔料によっても反射される。つまり、可視光線の透過率が高い有色顔料を用いたとしても、白色顔料がこの可視光線を反射するため、可視光線はアルミニウム箔本体表面まで至らず、アルミニウム箔本体の地色が反射しにくくなるのである。   On the other hand, since the packaging aluminum foil according to the present invention is colored with a colored pigment and a special white pigment, visible light having the reflected wavelength is reflected by the colored pigment and also reflected by the white pigment. Is done. That is, even if a colored pigment having a high visible light transmittance is used, the white pigment reflects this visible light, so the visible light does not reach the surface of the aluminum foil body, and the ground color of the aluminum foil body is difficult to reflect. It is.

以上の結果、本発明に係る包装用アルミニウム箔を用いれば、アルミニウム箔本体表面に赤外線透過性(近赤外線透過性を含む)の極めて高い表示が施されているので、アルミニウム箔製包装体を得る種々の任意の段階で、表示下のアルミニウム箔本体を含め、アルミニウム箔本体に傷などの欠陥が有るか否かを、赤外線(近赤外線)を用いて検査することができる。しかも、有色に着色された表示は、可視光線(当該有色の反射波長に対応する可視光線)を、特別な白色顔料によって良好に反射しうるので、当該有色顔料が可視光線を透過しやすいものであっても、その表示を明瞭に識別読解することができる。よって、アルミニウム箔製包装体の製造段階で、傷などの欠陥の有る不良品を排除しうると共に、明瞭な表示を持つアルミニウム箔製包装体を合理的に製造しうるという効果を奏する。   As a result of the above, if the aluminum foil for packaging according to the present invention is used, the aluminum foil main body surface is provided with an extremely high infrared transmissive (including near infrared transmissive) display, so an aluminum foil package is obtained. At various arbitrary stages, it can be inspected using infrared rays (near infrared rays) whether or not the aluminum foil body, including the aluminum foil body under display, has defects such as scratches. In addition, the colored display can easily reflect visible light (visible light corresponding to the reflected wavelength of the color) with a special white pigment, so that the colored pigment easily transmits visible light. Even if it exists, the display can be identified and read clearly. Therefore, at the manufacturing stage of the aluminum foil package, it is possible to eliminate defective products having defects such as scratches, and to produce an aluminum foil package having a clear display rationally.

以下、実施例に基づいて本発明を説明するが、本発明は実施例に限定されるものではない。本発明は、有色顔料と特別な白色顔料を含む印刷インキで印刷した表示は、赤外線を透過しやすくなると共に、有色顔料が可視光線を透過しやすいものであっても、その表示が読みやすいものになるとの知見に基づくものとして解釈されるべきである。   EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to an Example. In the present invention, a display printed with a printing ink containing a colored pigment and a special white pigment can easily transmit infrared rays, and even if the colored pigment easily transmits visible light, the display is easy to read. Should be interpreted as being based on the knowledge that

[白色顔料の準備]
(白色顔料1)
酢酸ビニル−塩化ビニル共重合体45重量部をロール分散機上で加熱溶融させ、そこに、その多くが一次粒子径20〜50nmであるルチル型二酸化チタン55重量部を添加して分散させて、平均粒径200nm程度の白色顔料を得た。
[Preparation of white pigment]
(White pigment 1)
45 parts by weight of vinyl acetate-vinyl chloride copolymer is heated and melted on a roll disperser, and 55 parts by weight of rutile titanium dioxide, most of which has a primary particle diameter of 20 to 50 nm, is added and dispersed therein. A white pigment having an average particle size of about 200 nm was obtained.

(白色顔料2)
酢酸ビニル−塩化ビニル共重合体30重量部をロール分散機上で加熱溶融させ、そこに平均一次粒子径が0.29μのルチル型二酸化チタン70重量部を添加して分散させて、平均粒径0.40μの白色顔料を得た。
(White pigment 2)
30 parts by weight of vinyl acetate-vinyl chloride copolymer is heated and melted on a roll disperser, and 70 parts by weight of rutile titanium dioxide having an average primary particle diameter of 0.29 μ is added and dispersed therein, thereby obtaining an average particle diameter. 0.40 micron white pigment was obtained.

[赤色印刷インキの準備]
(赤色印刷インキ1)
白色顔料1を3.3質量部、縮合アゾ系赤色顔料3.5質量部及び不溶性アゾ系赤色顔料1.3質量部を、塩化ビニル系樹脂14.3質量部をシクロヘキサノン77.6質量部に溶解させた塩化ビニル系樹脂ワニスに添加して、1時間、塗料分散機で混合分散させて、赤色印刷インキ1を得た。
[Preparation of red printing ink]
(Red printing ink 1)
3.3 parts by weight of white pigment 1, 3.5 parts by weight of condensed azo red pigment, 1.3 parts by weight of insoluble azo red pigment, 14.3 parts by weight of vinyl chloride resin to 77.6 parts by weight of cyclohexanone It was added to the dissolved vinyl chloride resin varnish and mixed and dispersed with a paint disperser for 1 hour to obtain a red printing ink 1.

(赤色印刷インキ2)
白色顔料2を4.2質量部、縮合アゾ系赤色顔料3.8質量部及び不溶性アゾ系赤色顔料3.3質量部を、塩化ビニル系樹脂15.7質量部をシクロヘキサノン73.0質量部に溶解させた塩化ビニル系樹脂ワニスに添加して、1時間、塗料分散機で混合分散させて、赤色印刷インキ2を得た。
(Red printing ink 2)
The white pigment 2 is 4.2 parts by mass, the condensed azo red pigment 3.8 parts by mass and the insoluble azo red pigment 3.3 parts by mass, the vinyl chloride resin 15.7 parts by mass is cyclohexanone 73.0 parts by mass. It was added to the dissolved vinyl chloride resin varnish and mixed and dispersed for 1 hour with a paint disperser to obtain red printing ink 2.

[青色印刷インキの準備]
(青色印刷インキ1)
白色顔料1を8.3質量部、青色顔料(フタロシアニンブルー)2.5質量部及び紫色顔料(ジオキサジンバイオレット)0.2質量部を、塩化ビニル系樹脂16.0質量部をシクロヘキサノン73.0質量部に溶解させた塩化ビニル系樹脂ワニスに添加して、1時間、塗料分散機で混合分散させて、青色印刷インキ1を得た。
[Preparation of blue printing ink]
(Blue printing ink 1)
8.3 parts by mass of white pigment 1, 2.5 parts by mass of blue pigment (phthalocyanine blue) and 0.2 parts by mass of purple pigment (dioxazine violet), 16.0 parts by mass of vinyl chloride resin, 73.0% of cyclohexanone Blue printing ink 1 was obtained by adding to a vinyl chloride resin varnish dissolved in parts by mass and mixing and dispersing with a paint disperser for 1 hour.

(青色印刷インキ2)
白色顔料2を10.5質量部、青色顔料(フタロシアニンブルー)2.5質量部及び紫色顔料(ジオキサジンバイオレット)0.1質量部を、塩化ビニル系樹脂16.0質量部をシクロヘキサノン71.0質量部に溶解させた塩化ビニル系樹脂ワニスに添加して、1時間、塗料分散機で混合分散させて、青色印刷インキ2を得た。
(Blue printing ink 2)
10.5 parts by mass of white pigment 2, 2.5 parts by mass of blue pigment (phthalocyanine blue) and 0.1 parts by mass of purple pigment (dioxazine violet), 16.0 parts by mass of vinyl chloride resin, 71.0 parts of cyclohexanone Blue printing ink 2 was obtained by adding to a vinyl chloride resin varnish dissolved in parts by mass and mixing and dispersing with a paint disperser for 1 hour.

[黄色印刷インキの準備]
(黄色印刷インキ1)
白色顔料1を6.6質量部、黄色顔料(ジスアゾエロー)3.0質量部及び橙色顔料(ジスアゾオレンジ)1.3質量部を、塩化ビニル系樹脂16.0質量部をシクロヘキサノン73.1質量部に溶解させた塩化ビニル系樹脂ワニスに添加して、1時間、塗料分散機で混合分散させて、黄色印刷インキ1を得た。
[Preparation of yellow printing ink]
(Yellow printing ink 1)
6.6 parts by mass of white pigment 1, 3.0 parts by mass of yellow pigment (disazo yellow) and 1.3 parts by mass of orange pigment (disazo orange), 16.0 parts by mass of vinyl chloride resin, 73.1 parts by mass of cyclohexanone A yellow printing ink 1 was obtained by adding to a vinyl chloride resin varnish dissolved in 1 and mixing and dispersing with a paint disperser for 1 hour.

(黄色印刷インキ2)
白色顔料2を6.3質量部、黄色顔料(ジスアゾエロー)3.0質量部及び橙色顔料(ジスアゾオレンジ)1.3質量部を、塩化ビニル系樹脂14.3質量部をシクロヘキサノン75.1質量部に溶解させた塩化ビニル系樹脂ワニスに添加して、1時間、塗料分散機で混合分散させて、黄色印刷インキ2を得た。
(Yellow printing ink 2)
6.3 parts by mass of white pigment 2, 3.0 parts by mass of yellow pigment (disazo yellow) and 1.3 parts by mass of orange pigment (disazo orange), 14.3 parts by mass of vinyl chloride resin, 75.1 parts by mass of cyclohexanone A yellow printing ink 2 was obtained by adding to a vinyl chloride resin varnish dissolved in and mixing and dispersing with a paint disperser for 1 hour.

[赤外線透過性試験]
厚さ12μmの透明ポリエステルフィルムの表面に、上記した各印刷インキ(赤色印刷インキ1及び2、青色印刷インキ1及び2、黄色印刷インキ1及び2)をバーコーター♯6で塗布して、表面が赤色、青色及び黄色に着色された6種類のポリエステルフィルムを得た。赤色印刷インキ1で印刷及び着色ポリエステルフィルムをR−1とし、赤色印刷インキ2で印刷及び着色ポリエステルフィルムをR−2とした。また、青色印刷インキ1による着色ポリエステルフィルムをB−1とし、青色印刷インキ2によるものをB−2とし、黄色印刷インキ1による着色ポリエステルフィルムをY−1とし、黄色印刷インキ2によるものをY−2とした。この各着色ポリエステルフィルムの光線透過率を、株式会社島津製作所製「UV−3100PC」を用いて測定した。そして、この結果を表1、表2及び表3に示した。なお、各色の印刷インキ1が本発明に係る実施例に相当するものであり、印刷インキ2が比較例に相当するものである。
[Infrared transmittance test]
Each of the above-described printing inks (red printing inks 1 and 2, blue printing inks 1 and 2, yellow printing inks 1 and 2) was applied to the surface of a transparent polyester film having a thickness of 12 μm using a bar coater # 6. Six types of polyester films colored in red, blue and yellow were obtained. Printing and coloring polyester film with red printing ink 1 was designated as R-1, and printing and coloring polyester film with red printing ink 2 as R-2. Moreover, the colored polyester film by blue printing ink 1 is set to B-1, the thing by blue printing ink 2 is set to B-2, the colored polyester film by yellow printing ink 1 is set to Y-1, and the thing by yellow printing ink 2 is set to Y. -2. The light transmittance of each colored polyester film was measured using “UV-3100PC” manufactured by Shimadzu Corporation. The results are shown in Tables 1, 2 and 3. In addition, the printing ink 1 of each color corresponds to the Example which concerns on this invention, and the printing ink 2 corresponds to a comparative example.

[表1]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
波長(nm) 透 過 率 (%)
━━━━━━━━━━━━━━━━
R−1 R−2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
360 13.03 16.96
380 25.42 22.87
400 26.67 18.57
420 26.85 15.72
440 26.17 13.49
460 20.85 9.39
480 13.83 5.11
500 7.45 2.12
520 6.39 1.60
540 3.70 0.78
560 15.25 4.95
580 32.08 11.79
600 70.39 39.19
620 76.76 44.83
640 79.03 46.98
660 80.26 48.51
680 80.89 49.87
700 81.10 51.36
720 81.53 52.98
740 82.06 54.74
760 83.06 56.68
780 84.30 58.69
800 85.75 60.45
820 86.38 61.92
840 89.40 63.76
860 89.54 65.72
880 89.16 66.99
900 89.67 67.30
950 90.25 68.31
1000 88.32 71.04
1050 87.53 72.39
1100 88.14 73.29
1150 88.21 74.76
1200 87.94 76.18
1250 89.75 77.20
1300 86.26 78.83
1350 88.86 78.82
1400 83.32 77.28
1450 84.46 77.94
1500 84.46 76.24
1550 86.16 75.69
1600 85.95 75.05
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
[Table 1]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Wavelength (nm) Permeability (%)
━━━━━━━━━━━━━━━━
R-1 R-2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
360 13.03 16.96
380 25.42 22.87
400 26.67 18.57
420 26.85 15.72
440 26.17 13.49
460 20.85 9.39
480 13.83 5.11
500 7.45 2.12
520 6.39 1.60
540 3.70 0.78
560 15.25 4.95
580 32.08 11.79
600 70.39 39.19
620 76.76 44.83
640 79.03 46.98
660 80.26 48.51
680 80.89 49.87
700 81.10 51.36
720 81.53 52.98
740 82.06 54.74
760 83.06 56.68
780 84.30 58.69
800 85.75 60.45
820 86.38 61.92
840 89.40 63.76
860 89.54 65.72
880 89.16 66.99
900 89.67 67.30
950 90.25 68.31
1000 88.32 71.04
1050 87.53 72.39
1100 88.14 73.29
1150 88.21 74.76
1200 87.94 76.18
1250 89.75 77.20
1300 86.26 78.83
1350 88.86 78.82
1400 83.32 77.28
1450 84.46 77.94
1500 84.46 76.24
1550 86.16 75.69
1600 85.95 75.05
━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[表2]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
波長(nm) 透 過 率 (%)
━━━━━━━━━━━━━━━━
B−1 B−2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
360 1.34 0.58
380 10.21 1.82
400 26.71 3.08
420 35.27 2.95
440 42.06 2.81
460 46.07 2.62
480 48.29 2.46
500 48.15 2.33
520 44.11 2.09
540 36.24 1.66
560 21.83 0.89
580 12.28 0.45
600 8.50 0.33
620 7.95 0.43
640 10.55 0.80
660 17.49 1.71
680 17.97 1.98
700 13.15 1.71
720 15.54 2.98
740 39.56 8.98
760 70.90 16.50
780 79.32 19.06
800 81.68 20.81
820 82.63 22.55
840 84.42 24.46
860 84.77 26.32
880 85.14 28.60
900 85.66 30.42
950 85.41 34.64
1000 84.63 39.17
1050 84.43 42.89
1100 84.58 45.86
1150 85.21 48.91
1200 85.57 52.08
1250 85.71 55.16
1300 84.27 58.07
1350 84.47 59.93
1400 85.87 60.46
1450 84.21 63.29
1500 83.60 62.92
1550 83.33 63.17
1600 82.81 64.25
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
[Table 2]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Wavelength (nm) Permeability (%)
━━━━━━━━━━━━━━━━
B-1 B-2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
360 1.34 0.58
380 10.21 1.82
400 26.71 3.08
420 35.27 2.95
440 42.06 2.81
460 46.07 2.62
480 48.29 2.46
500 48.15 2.33
520 44.11 2.09
540 36.24 1.66
560 21.83 0.89
580 12.28 0.45
600 8.50 0.33
620 7.95 0.43
640 10.55 0.80
660 17.49 1.71
680 17.97 1.98
700 13.15 1.71
720 15.54 2.98
740 39.56 8.98
760 70.90 16.50
780 79.32 19.06
800 81.68 20.81
820 82.63 22.55
840 84.42 24.46
860 84.77 26.32
880 85.14 28.60
900 85.66 30.42
950 85.41 34.64
1000 84.63 39.17
1050 84.43 42.89
1100 84.58 45.86
1150 85.21 48.91
1200 85.57 52.08
1250 85.71 55.16
1300 84.27 58.07
1350 84.47 59.93
1400 85.87 60.46
1450 84.21 63.29
1500 83.60 62.92
1550 83.33 63.17
1600 82.81 64.25
━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[表3]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
波長(nm) 透 過 率 (%)
━━━━━━━━━━━━━━━━
Y−1 Y−2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
360 6.37 7.63
380 8.50 3.74
400 7.17 1.19
420 4.97 0.34
440 4.56 0.25
460 5.67 0.41
480 10.20 1.08
500 12.97 1.79
520 24.69 4.42
540 27.54 4.98
560 37.78 7.34
580 51.42 11.16
600 58.73 13.81
620 62.98 15.87
640 66.26 17.73
660 68.86 19.50
680 71.00 21.30
700 72.72 23.13
720 74.32 25.05
740 75.68 27.02
760 77.20 29.08
780 78.72 31.18
800 80.24 33.17
820 81.67 35.01
840 83.96 36.99
860 84.32 39.22
880 85.48 41.13
900 85.77 42.31
950 85.50 45.47
1000 83.93 49.65
1050 83.37 52.76
1100 83.62 55.67
1150 83.46 58.11
1200 84.09 60.72
1250 84.05 63.59
1300 86.93 64.92
1350 84.09 67.48
1400 84.35 67.88
1450 82.35 68.16
1500 82.84 67.06
1550 83.15 66.58
1600 81.46 67.97
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
[Table 3]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Wavelength (nm) Permeability (%)
━━━━━━━━━━━━━━━━
Y-1 Y-2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
360 6.37 7.63
380 8.50 3.74
400 7.17 1.19
420 4.97 0.34
440 4.56 0.25
460 5.67 0.41
480 10.20 1.08
500 12.97 1.79
520 24.69 4.42
540 27.54 4.98
560 37.78 7.34
580 51.42 11.16
600 58.73 13.81
620 62.98 15.87
640 66.26 17.73
660 68.86 19.50
680 71.00 21.30
700 72.72 23.13
720 74.32 25.05
740 75.68 27.02
760 77.20 29.08
780 78.72 31.18
800 80.24 33.17
820 81.67 35.01
840 83.96 36.99
860 84.32 39.22
880 85.48 41.13
900 85.77 42.31
950 85.50 45.47
1000 83.93 49.65
1050 83.37 52.76
1100 83.62 55.67
1150 83.46 58.11
1200 84.09 60.72
1250 84.05 63.59
1300 86.93 64.92
1350 84.09 67.48
1400 84.35 67.88
1450 82.35 68.16
1500 82.84 67.06
1550 83.15 66.58
1600 81.46 67.97
━━━━━━━━━━━━━━━━━━━━━━━━━━━━

表1の結果から明らかなように、赤色印刷インキ1で着色したポリエステルフィルムは、赤色印刷インキ2で着色したポリエステルフィルムの場合と比べて、赤色の反射波長である600nm近傍の箇所で、光線透過率が急激に高くなる。そして、近赤外線領域を含む赤外線領域に至ると、赤色印刷インキ2のものと比べて、顕著に高い赤外線透過率を示している。また、表2の結果から明らかなように、青色印刷インキ1で着色したポリエステルフィルムは、青色印刷インキ2で着色したポリエステルフィルムの場合と比べて、青色の反射波長である450nm近傍の箇所で、光線透過率が急激に高くなる。しかし、可視光線領域では透過率が相対的に低く推移し、赤外線領域に至ると、青色印刷インキ2で着色したものに比べて、顕著に高い赤外線透過率を示している。さらに、表3の結果から明らかなように、黄色印刷インキ1で着色したポリエステルフィルムは、黄色印刷インキ2で着色したポリエステルフィルムの場合と比べて、黄色の反射波長である600nm近傍の箇所で、光線透過率が急激に高くなる。そして、近赤外線領域を含む赤外線領域に至ると、黄色印刷インキ2のものと比べて、顕著に高い赤外線透過率を示している。   As is clear from the results in Table 1, the polyester film colored with the red printing ink 1 transmits light at a position near 600 nm, which is the red reflection wavelength, as compared with the polyester film colored with the red printing ink 2. The rate increases rapidly. And when reaching the infrared region including the near infrared region, the infrared transmittance is significantly higher than that of the red printing ink 2. Further, as is clear from the results in Table 2, the polyester film colored with the blue printing ink 1 is compared with the polyester film colored with the blue printing ink 2 at a location near 450 nm which is the blue reflection wavelength. The light transmittance increases rapidly. However, the transmittance is relatively low in the visible light region, and when reaching the infrared region, the infrared transmittance is significantly higher than that of the one colored with the blue printing ink 2. Furthermore, as is clear from the results in Table 3, the polyester film colored with the yellow printing ink 1 has a yellow reflection wavelength near 600 nm as compared to the polyester film colored with the yellow printing ink 2. The light transmittance increases rapidly. And when reaching the infrared region including the near infrared region, the infrared transmittance is significantly higher than that of the yellow printing ink 2.

Claims (4)

アルミニウム箔本体表面に、文字や図柄などの表示を印刷してなる包装用アルミニウム箔において、前記表示は、有色顔料及び白色顔料を含む印刷インキを用いて印刷することによって形成されたものであり、該白色顔料は、白色顔料本体表面が合成樹脂膜によって被覆されており、該白色顔料本体は二酸化チタンであって、その一次粒子径の大きさは20〜50nmのものが主体であることを特徴とする赤外線透過性に優れた表示を印刷してなる包装用アルミニウム箔。   In the aluminum foil for packaging formed by printing a display such as characters and designs on the surface of the aluminum foil main body, the display is formed by printing using a printing ink containing a colored pigment and a white pigment, The white pigment main body is coated with a synthetic resin film on the surface of the white pigment main body, the white pigment main body is titanium dioxide, and the primary particle size is mainly 20 to 50 nm. An aluminum foil for packaging formed by printing a display excellent in infrared transparency. 請求項1記載の包装用アルミニウム箔を用いて得られたアルミニウム箔製包装体。   An aluminum foil package obtained using the packaging aluminum foil according to claim 1. アルミニウム箔製包装体が、ブリスターパックである請求項2記載のアルミニウム箔製包装体。   The aluminum foil package according to claim 2, wherein the aluminum foil package is a blister pack. ブリスターパックが、プレススルーパックである請求項3記載のアルミニウム箔製包装体。   The aluminum foil package according to claim 3, wherein the blister pack is a press-through pack.
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