JP2009051903A - Light-blocking ink - Google Patents
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- JP2009051903A JP2009051903A JP2007218512A JP2007218512A JP2009051903A JP 2009051903 A JP2009051903 A JP 2009051903A JP 2007218512 A JP2007218512 A JP 2007218512A JP 2007218512 A JP2007218512 A JP 2007218512A JP 2009051903 A JP2009051903 A JP 2009051903A
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 41
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000009835 boiling Methods 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 12
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004698 Polyethylene Substances 0.000 claims abstract description 6
- -1 polyethylene Polymers 0.000 claims abstract description 6
- 229920000573 polyethylene Polymers 0.000 claims abstract description 6
- 238000007639 printing Methods 0.000 claims description 39
- 239000005022 packaging material Substances 0.000 claims description 33
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical group CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 15
- 239000010419 fine particle Substances 0.000 claims description 14
- 239000008119 colloidal silica Substances 0.000 claims description 5
- 239000011087 paperboard Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 18
- 238000005299 abrasion Methods 0.000 abstract description 2
- 239000002648 laminated material Substances 0.000 abstract 2
- 239000000976 ink Substances 0.000 description 46
- 239000000123 paper Substances 0.000 description 22
- 235000019645 odor Nutrition 0.000 description 17
- 238000002834 transmittance Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000011707 mineral Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 235000015096 spirit Nutrition 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 235000013336 milk Nutrition 0.000 description 4
- 239000008267 milk Substances 0.000 description 4
- 210000004080 milk Anatomy 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000007646 gravure printing Methods 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- YKYONYBAUNKHLG-UHFFFAOYSA-N propyl acetate Chemical compound CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Abstract
Description
本発明は、包装材料及びこれを使用した包装容器に遮光性を付与することができ、かつ印刷したとき臭気の少ないインキに関する。さらに詳しくは、紙を主材とした積層構造の包装材料に印刷することによって、その包装材料を用いた包装容器中の内容物の光による品質劣化を抑制し、当該内容物に異臭を付することのないインキに関する。 The present invention relates to a packaging material and an ink that can impart light-shielding properties to a packaging container using the packaging material and has little odor when printed. More specifically, by printing on a packaging material having a laminated structure using paper as a main material, quality deterioration due to light of the contents in the packaging container using the packaging material is suppressed, and the contents are given a strange odor. It relates to an ink that has nothing.
近年、牛乳、ジュース等の飲料は、コスト優位性やその利便性が評価されて、板紙を主体とし、これにポリオレフィン樹脂をラミネートした構造の包装容器（以下「紙パック容器」ともいう。）が多く使用されている。これらの紙パック容器は、紙及びポリオレフィン樹脂層その他で積層された構造であるためかなりの程度光が透過する。従って、これらの紙パック容器に詰められた牛乳、ジュース等の内容物は、流通過程や店舗での陳列時に光の影響を受けて、味や香り等に変化を生じる。 In recent years, beverages such as milk and juice have been evaluated for cost advantage and convenience, and a packaging container (hereinafter, also referred to as “paper pack container”) having a structure mainly composed of paperboard and laminated with a polyolefin resin thereon. Many are used. Since these paper pack containers have a structure in which they are laminated with paper and a polyolefin resin layer or the like, a considerable amount of light is transmitted. Therefore, the contents such as milk and juice packed in these paper pack containers are affected by light during the distribution process and display in the store, and change in taste, aroma, and the like.
この透過光による内容物の変化、即ち、品質劣化に対応するため、従来の紙パック容器では、遮光性のあるアルミニウム箔を、容器内側へ貼り付けたものを使用して対処してきた。この容器包装は、遮光性については十分な機能を果たすが、コストアップとなるばかりでなく、リサイクル上の難点があった。 In order to cope with the change in the contents due to the transmitted light, that is, the quality deterioration, the conventional paper pack container has dealt with using a light-shielding aluminum foil attached to the inside of the container. Although this container and package fulfills a sufficient function with respect to light shielding properties, it not only increases the cost, but also has a difficulty in recycling.
そこで、特許文献１には、包装材の基材と最内層との間にカーボンブラックを含むインキを塗布した遮光性印刷層と、前記遮光性印刷層の内側に位置する着色印刷層を設けた紙パック用の包装材料が開示されている。 Therefore, Patent Document 1 is provided with a light-shielding printing layer in which an ink containing carbon black is applied between the base material and the innermost layer of the packaging material, and a colored printing layer positioned inside the light-shielding printing layer. A packaging material for a paper pack is disclosed.
また、特許文献２には、アルミニウム箔を含まない包装材料で、基材の紙層の外側にデザイン印刷層、白色印刷層、遮光着色印刷層を設け、最内層に熱可塑性樹脂を配した構成の包装材料が開示されている。 Patent Document 2 is a packaging material that does not include an aluminum foil, and is provided with a design printing layer, a white printing layer, a light-shielding colored printing layer outside the paper layer of the base material, and a thermoplastic resin disposed on the innermost layer. A packaging material is disclosed.
遮光のためにカーボンブラックを含むインキを塗布したものは遮光性に優れるが、意匠性に乏しく、消費者の購買意欲を刺激するための容器としては採用することは難しいと言わなければならない。そこで、特許文献１のように、この黒色印刷層の上にさらにデザイン印刷することになるが、下地となる黒色印刷がデザイン印刷に大きな影響を及ぼし、デザイン印刷の出来栄えを損なう結果となる。 A material coated with carbon black-containing ink for light shielding is excellent in light shielding properties, but has poor design properties, and it must be said that it is difficult to adopt as a container for stimulating consumers' willingness to purchase. Therefore, as in Patent Document 1, design printing is further performed on the black printing layer. However, the black printing as a base has a great influence on the design printing, resulting in a deterioration in the quality of the design printing.
特許文献２では、黒色インキによるデザイン印刷層への影響を少なくするため、白色印刷層を設け、その上にデザイン印刷層を設けているが、工程が増えてコストアップになる。 In Patent Document 2, in order to reduce the influence of the black ink on the design print layer, a white print layer is provided and a design print layer is provided thereon. However, the number of processes increases and the cost increases.
また、インキに使用している溶媒やカーボンブラック等による臭気の問題、さらには、これらの臭気が内容物に移る等の問題があった。 Further, there are problems of odor due to the solvent used in the ink, carbon black and the like, and further, these odors are transferred to the contents.
さらに、遮光性インキを最外層に印刷する場合は、その印刷が剥がれると遮光性能が低下するため、そのインキには輸送時等でのこすれにも耐えることのできる密着性及び耐摩擦性が要求される。 Furthermore, when printing the light-shielding ink on the outermost layer, the light-shielding performance decreases when the print is peeled off, so the ink must have adhesion and friction resistance that can withstand rubbing during transportation. Is done.
ところで、微粉化されたアルミニウムをミネラルスピリット等の沸点の高い炭化水素系溶剤中で分散してペースト状にしたアルミニウムペーストを、メジウムに分散させた所謂銀インキが知られており、その輝度性を利用してデザイン性のある印刷物に利用されている。この種の銀インキは、ある程度の遮光性をその印刷物に与えることが期待できるが、その印刷物は、密着性及び耐摩擦性が低い上、炭化水素系溶剤による臭気も問題になる。 By the way, so-called silver ink is known in which finely divided aluminum is dispersed in a medium by dispersing it in a hydrocarbon solvent having a high boiling point such as mineral spirits, and dispersed in a medium. It is used for printed matter with design. This type of silver ink can be expected to give a certain degree of light-shielding properties to the printed matter, but the printed matter has low adhesion and friction resistance and also has a problem of odor due to hydrocarbon solvents.
従って、本発明は、包装容器のデザインや見た目の清潔さなどに悪影響を及ぼすことがなく、簡便に紙容器に遮光性を付与することができ、かつ臭気が少ないため、その内容物の味及びにおいを変化させることのない、密着性及び耐摩擦性に優れた紙パック用インキ、並びに当該紙パック用インキを用いた紙パック容器を提供することを課題とする。 Therefore, the present invention does not adversely affect the design of the packaging container and the cleanness of the appearance, can easily impart light shielding properties to the paper container, and has less odor. It is an object of the present invention to provide a paper pack ink that does not change odor and has excellent adhesion and friction resistance, and a paper pack container using the paper pack ink.
本発明者らは、意匠性を犠牲にすることなく包装容器に遮光性を付与する方法を検討した結果、特定のアルミニウムペーストを選択し、さらに他の添加物を工夫することによって、前記課題を解決できることを見出し、本発明を完成した。 As a result of examining a method for imparting light-shielding properties to a packaging container without sacrificing design properties, the present inventors have selected the specific aluminum paste and further devised other additives to solve the above problem. As a result, the present invention has been completed.
上記課題を解決するため、請求項１に係る発明は、低沸点エステル系溶媒及び／又は低沸点アルコール系溶媒に分散したノンリーフィングタイプのアルミニウムペースト、ポリエチレンワックス及びシリカを含有することを特徴とする遮光性インキである。 In order to solve the above-mentioned problem, the invention according to claim 1 is characterized by containing a non-leafing type aluminum paste, polyethylene wax and silica dispersed in a low boiling ester solvent and / or a low boiling alcohol solvent. It is a light-shielding ink.
請求項２に係る発明は、前記低沸点アルコール系溶媒がイソプロピルアルコールであることを特徴とする請求項1記載の遮光性インキである。 The invention according to claim 2 is the light-shielding ink according to claim 1, wherein the low-boiling alcohol solvent is isopropyl alcohol.
請求項３に係る発明は、前記アルミニウムペースト中のアルミニウム微粒子が、平均粒径５〜１５μｍであることを特徴とする請求項１又は２記載の遮光性インキである。 The invention according to claim 3 is the light-shielding ink according to claim 1 or 2, wherein the aluminum fine particles in the aluminum paste have an average particle diameter of 5 to 15 µm.
請求項４に係る発明は、前記シリカが、コロイダルシリカであることを特徴とする請求項１〜３のいずれかに記載の遮光性インキである。 The invention according to claim 4 is the light-shielding ink according to any one of claims 1 to 3, wherein the silica is colloidal silica.
請求項５に係る発明は、板紙基材の内面及び外面に合成樹脂層を備えた積層包装材料において、請求項１〜４のいずれかに記載の遮光性インキを用いた遮光性印刷層を設けたことを特徴とする遮光性積層包装材料である。 The invention according to claim 5 provides a light-shielding printing layer using the light-shielding ink according to any one of claims 1 to 4 in a laminated packaging material provided with a synthetic resin layer on an inner surface and an outer surface of a paperboard substrate. This is a light-shielding laminated packaging material characterized by the above.
請求項６に係る発明は、請求項５記載の遮光性積層包装材料から作製される包装容器である。 The invention according to claim 6 is a packaging container produced from the light-shielding laminated packaging material according to claim 5.
本発明によると、本発明のインキは包装材料及びこれを使用した包装容器、特に紙パック容器に印刷という極めて簡単な手段で優れた遮光性を与えて、その内容物の光による品質劣化を抑制できるうえ、内容物へ異臭を与えることがなく、通常のインキと比べ遮光性が高いため、長時間の光照射にも品質劣化の抑制効果が高い。また、本発明のインキによる印刷層は密着性及び耐摩擦性に優れ、輸送時等のこすれにも耐えるため、遮光性が持続する。 According to the present invention, the ink of the present invention provides excellent light-shielding properties by a very simple means of printing on a packaging material and a packaging container using the packaging material, particularly a paper pack container, and suppresses deterioration of the contents due to light In addition, it does not give off a strange odor to the contents and has a higher light shielding property than ordinary inks. In addition, the printed layer of the ink of the present invention is excellent in adhesion and friction resistance and resists rubbing during transportation, etc., so that the light shielding property is maintained.
また、カーボンブラック等を使用した黒色系のインキを使用せずに、輝度の高い銀色の遮光性印刷層を形成できるため、この上にデザイン印刷しても、下地色がデザイン印刷に影響せず、通常の印刷で自由な色彩のデザイン印刷が可能となる。 In addition, since it is possible to form a silvery light-shielding printing layer with high brightness without using black ink using carbon black, etc., even if design printing is performed on this, the base color does not affect the design printing. It is possible to print designs with free colors using normal printing.
さらに、本発明の遮光性積層包装材料及びそれから製作される包装容器は、アルミニウム箔などを使用していないので、金属探知機への影響がない。 Furthermore, since the light-shielding laminated packaging material of the present invention and the packaging container produced therefrom do not use aluminum foil or the like, there is no influence on the metal detector.
以下、本発明を実施するための最良の形態を詳細に説明する。なお、本実施形態は、本発明を実施するための一形態に過ぎず、本発明は本実施形態によって限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更実施の形態が可能である。 Hereinafter, the best mode for carrying out the present invention will be described in detail. Note that this embodiment is merely an embodiment for carrying out the present invention, and the present invention is not limited by this embodiment, and various modified embodiments can be made without departing from the gist of the present invention. Is possible.
通常の銀インキは、インキ重量に対し平均粒径５〜２０μｍのアルミニウム微粒子が５〜２０重量％になるようにアルミニウムペーストをメジウムに分散させたものである。当該アルミニウムペーストは、アルミニウム微粒子が沸点の高いミネラルスピリット中に分散してペースト状となっているものであるが、本発明の遮光性インキは、前記銀インキをベースに、以下で説明するような改良を加えて遮光性、輝度、密着性及び耐摩擦性を向上させた。 Ordinary silver ink is obtained by dispersing an aluminum paste in medium so that aluminum fine particles having an average particle diameter of 5 to 20 μm are 5 to 20% by weight with respect to the ink weight. The aluminum paste is a paste in which aluminum fine particles are dispersed in mineral spirits having a high boiling point. The light-shielding ink of the present invention is based on the silver ink as described below. Improvements were made to improve light-shielding properties, brightness, adhesion, and friction resistance.
本発明の遮光性インキに用いるアルミニウムペーストは、ノンリーフィングタイプのアルミニウム微粒子を低沸点エステル系溶媒及び／又は低沸点アルコール系溶媒中で分散したものである。なお、前記アルミニウムペースト中のアルミニウム微粒子と溶媒との混合比率は重量比で６／４から７／３程度のものである。 The aluminum paste used in the light-shielding ink of the present invention is obtained by dispersing non-leafing type aluminum fine particles in a low-boiling ester solvent and / or a low-boiling alcohol solvent. The mixing ratio of the aluminum fine particles and the solvent in the aluminum paste is about 6/4 to 7/3 by weight.
アルミニウムペーストは、ミネラルスピリット中に分散しているのが、一般的であるが、本発明では、このミネラルスピリットを低沸点エステル系溶媒及び／又は低沸点アルコール系溶媒で置換したものを用いる。これによって高沸点溶媒であるミネラルスピリットによる臭気が低減し、印刷物としたときその臭気が殆ど感じられなくなり、内容物に異臭を与えることがない。 The aluminum paste is generally dispersed in mineral spirits, but in the present invention, the mineral spirit is replaced with a low-boiling ester solvent and / or a low-boiling alcohol solvent. As a result, the odor due to mineral spirit, which is a high-boiling solvent, is reduced, and when the printed material is produced, the odor is hardly felt and the contents are not given a strange odor.
前記低沸点エステル系溶媒としては、酢酸エチル、酢酸 ｎ−プロピル等の低級アルキルエステルが好ましく、前記低沸点アルコール系溶媒としてはエタノール、イソプロピルアルコール等の低級アルコールが好ましい。 The low-boiling ester solvent is preferably a lower alkyl ester such as ethyl acetate or n-propyl acetate, and the low-boiling alcohol solvent is preferably a lower alcohol such as ethanol or isopropyl alcohol.
また、前記アルミニウムペーストに用いるアルミニウム微粒子は、ノンリーフィングタイプが好ましい。リーフィングタイプのアルミニウムペーストは、アルミニウム微粒子が表面に浮かび上るため、耐摩擦性及びインキ皮膜の密着性が悪い。一方、ノンリーフィングタイプは、インキ皮膜中にランダムに分散する性質があるため薄片状のアルミニウム微粒子間にインキ材料に用いる樹脂が入り込みやすくなる。その結果、インキ皮膜の密着性が向上し剥がれ落ちることがなく耐摩擦性も改善される。 The aluminum fine particles used for the aluminum paste are preferably non-leafing type. Leafing type aluminum paste has poor friction resistance and ink film adhesion because aluminum fine particles float on the surface. On the other hand, since the non-leafing type has the property of being randomly dispersed in the ink film, the resin used for the ink material easily enters between the flaky aluminum fine particles. As a result, the adhesion of the ink film is improved and the friction resistance is improved without peeling off.
前記アルミニウム微粒子の平均粒径は５〜１５μｍが好ましい。アルミニウム微粒子の平均粒径が５μｍより小さいと輝度が大きく低下するため意匠性に欠けたものとなるばかりでなく、インキ皮膜の密着性が低下するため剥がれやすくなる。また、１５μｍを超えるとインキ中での沈降が起こりやすく、印刷したとき抜けが多くなって隠蔽性が低下するため遮光性が低下する。なお、ここでの平均粒径は、レーザー法（ＭＩＣＲＯＴＲＡＣ ９３２０−Ｘ１００ Ｈｏｎｅｙｗｅｌｌ製）による測定値である。 The average particle size of the aluminum fine particles is preferably 5 to 15 μm. If the average particle size of the aluminum fine particles is smaller than 5 μm, the brightness is greatly reduced and the design is not satisfactory, and the adhesion of the ink film is reduced, and the aluminum particles are easily peeled off. On the other hand, if it exceeds 15 μm, sedimentation in the ink tends to occur, and when printing is performed, there are many omissions and the concealing property is lowered, so that the light shielding property is lowered. In addition, the average particle diameter here is a measured value by a laser method (manufactured by MICROTRAC 9320-X100 Honeywell).
前記アルミニウム微粒子の添加量は、本発明のインキに対して１０〜２０重量％である。アルミニウム微粒子の添加量が１０重量％未満では、輝度が低下するため印刷物が意匠性に欠けたものとなり、印刷物の遮光性も不十分となるため好ましくない。また、２０重量％を超えると版詰まり、ツーツー汚れ等が起きやすく、密着性も低下するため好ましくない。 The addition amount of the aluminum fine particles is 10 to 20% by weight with respect to the ink of the present invention. If the addition amount of the aluminum fine particles is less than 10% by weight, the brightness is lowered and the printed matter lacks design properties, and the light shielding property of the printed matter becomes insufficient. On the other hand, if it exceeds 20% by weight, plate clogging, two-to-stain and the like are likely to occur, and the adhesiveness is also deteriorated.
本発明の遮光性インキに用いるポリエチレンワックスは、当該インキに対して０．５〜２．０重量％である。当該ポリエチレンワックスの添加量が０．５重量％未満では、耐摩擦性が不十分となりインキが取られやすくなる。また、２．０重量％を超えると過剰添加となり印刷適性が低下するばかりでなく滑りやすくなり光沢が低下するため好ましくない。 The polyethylene wax used for the light-shielding ink of the present invention is 0.5 to 2.0% by weight based on the ink. When the added amount of the polyethylene wax is less than 0.5% by weight, the friction resistance is insufficient and the ink is easily taken. On the other hand, if it exceeds 2.0% by weight, it is not preferable because it is excessively added and not only printability is lowered but also slippery and gloss is lowered.
本発明の遮光性インキでは、耐摩擦性を更に向上させるために、粒子径５〜１００ｎｍのシリカを添加するが、当該シリカとして、シリカ微粒子が溶媒中に均一に分散した状態となっているコロイダルシリカを用いるのが好ましく、その分散溶媒としては、アルミニウムペーストの分散溶媒と同様に低沸点エステル系溶媒及び／又は低沸点アルコール系溶媒が好ましい。
また、前記コロイダルシリカの添加量は、当該インキに対し１〜１０重量％が好ましい。添加量が１重量％未満では、耐摩擦性向上の効果が不十分で、１０重量％を超えると実用上過剰量となるばかりでなく、コストアップとなり好ましくない。なお、シリカの粒子径は、ＢＥＴ法で測定した値である。
In the light-shielding ink of the present invention, in order to further improve the friction resistance, silica having a particle diameter of 5 to 100 nm is added. As the silica, colloidal in which silica fine particles are uniformly dispersed in a solvent. Silica is preferably used, and the dispersion solvent is preferably a low-boiling ester solvent and / or a low-boiling alcohol solvent similarly to the dispersion solvent of the aluminum paste.
The amount of colloidal silica added is preferably 1 to 10% by weight based on the ink. If the addition amount is less than 1% by weight, the effect of improving the friction resistance is insufficient. If the addition amount exceeds 10% by weight, not only an excessive amount is practically used, but also the cost increases, which is not preferable. The particle diameter of silica is a value measured by the BET method.
本発明の遮光性インキを、板紙基材の内面及び外面に合成樹脂層を備えた積層包装材料の遮光性を必要とする部分にベタ印刷し（遮光性印刷層）、その上にデザイン印刷層を設け、これを、紙パック容器に組立てる。 The light-shielding ink of the present invention is solid-printed on a portion of the laminated packaging material provided with a synthetic resin layer on the inner surface and outer surface of the paperboard substrate that requires light-shielding properties (light-shielding printing layer), and a design printing layer thereon And assemble it into a paper pack container.
本発明の遮光性インキによる遮光性印刷層の厚さは、１〜２０μｍが好ましい。１μｍ未満では、遮光性が不十分で、２０μｍを超えると実用上過剰量となるばかりでなく、コストアップとなる。印刷方法としては、グラビア印刷法、オフセット印刷法、フレキソ印刷法などが採用できるが、グラビア印刷法が好ましい。 As for the thickness of the light-shielding printing layer by the light-shielding ink of this invention, 1-20 micrometers is preferable. If it is less than 1 μm, the light-shielding property is insufficient, and if it exceeds 20 μm, not only is it practically excessive, but also the cost is increased. As a printing method, a gravure printing method, an offset printing method, a flexographic printing method, or the like can be adopted, but a gravure printing method is preferable.
以下に実施例をあげて具体的に説明する。 Hereinafter, specific examples will be described.
＜実施例１〜４＞
表１の配合の成分を混合分散して遮光性インキを製造した。なお、使用したアルミニウムペーストはノンリーフィングタイプで、平均粒径９μｍ、含有量７０重量％のイソプロピルアルコール分散体である。また、実施例４で使用したコロイダルシリカは、表１の注に示したように粒子径４０〜５０ｎｍで含有量３０重量％のイソプロピルアルコール分散体である。
The ingredients of Table 1 were mixed and dispersed to produce a light-shielding ink. The aluminum paste used is a non-leafing type, and is an isopropyl alcohol dispersion having an average particle size of 9 μm and a content of 70% by weight. The colloidal silica used in Example 4 is an isopropyl alcohol dispersion having a particle size of 40 to 50 nm and a content of 30% by weight as shown in the note of Table 1.
＜比較例１〜７＞
表２の配合の成分を混合分散してインキを製造した。なお、比較例１〜３で使用したアルミニウムペーストは実施例で使用したものと同じものであるが、比較例４及び５は、ノンリーフィングタイプ（平均粒径９μｍ、含有量７０重量％、ミネラルスピリット分散体）を、比較例６はリーフィングタイプ（平均粒径６μｍ、含有量６７重量％、ミネラルスピリット分散体）を、また比較例７は、ノンリーフィングタイプ（平均粒径２１μｍ、含有量７１重量％、ミネラルスピリット分散体）を使用した。
<Comparative Examples 1-7>
Inks were prepared by mixing and dispersing the ingredients of the formulation shown in Table 2. The aluminum paste used in Comparative Examples 1 to 3 is the same as that used in Examples, but Comparative Examples 4 and 5 are non-leafing type (average particle size 9 μm, content 70% by weight, mineral spirits). Comparative Example 6 is a leafing type (average particle size 6 μm, content 67 wt%, mineral spirit dispersion), and Comparative Example 7 is a non-leafing type (average particle size 21 μm, content 71 wt%). Mineral spirit dispersion).
＜ベタ印刷包装材の作製＞
原紙としてフィンランド国エンソ社製のロール紙（幅５８７ｍｍ×長さ４０００ｍｍ×厚さ０．４３ｍｍ 上面に厚さ０．０１７ｍｍの外面熱可塑性樹脂層、下面に厚さ０．０２７ｍｍの内面熱可塑性樹脂層を設けたもの）を用い、実施例１〜４及び比較例１〜７で製造したインキを１０μｍの厚さにベタでグラビア印刷した。なお、実施例１〜４を印刷した包装材を各々サンプル１〜４、比較例１〜７を各々サンプル５〜１１とした。
他に、東京インキ（株）製のＬＲＣ−ＮＴインキシリーズを用いて同様にベタでグラビア印刷したサンプル１２（赤色印刷）、サンプル１３（青色印刷）、サンプル１４（黄色印刷）、サンプル１５（黒色印刷）及びサンプル１６（印刷していない無地原紙）を用意した。
<Preparation of solid printing packaging material>
Roll paper manufactured by Enso Co., Ltd. as a base paper (width 587 mm × length 4000 mm × thickness 0.43 mm, outer surface thermoplastic resin layer having a thickness of 0.017 mm on the upper surface, and inner surface thermoplastic resin layer having a thickness of 0.027 mm on the lower surface The inks produced in Examples 1 to 4 and Comparative Examples 1 to 7 were subjected to gravure printing with a solid thickness of 10 μm. In addition, the packaging material which printed Examples 1-4 was made into samples 1-4, respectively, and Comparative Examples 1-7 were made into samples 5-11, respectively.
In addition, sample 12 (red printing), sample 13 (blue printing), sample 14 (yellow printing), and sample 15 (black printing) using the LRC-NT ink series manufactured by Tokyo Ink Co., Ltd. Printing) and Sample 16 (plain base paper not printed) were prepared.
＜光透過率＞
サンプル１及びサンプル１２〜１６について、日本分光（株）製のＵｂｅｓｔシリーズ Ｖ−５６０ｉＲＭ／ＤＳ分光光度計を用いて、２３０ｎｍ〜８３０ｎｍでの光透過率を測定し、その結果を図１〜６に示した。
<Light transmittance>
About the sample 1 and the samples 12-16, the transmittance | permeability in 230 nm-830 nm was measured using the Ubest series V-560iRM / DS spectrophotometer by JASCO Corporation, and the result is shown in FIGS. Indicated.
＜耐摩擦性及び耐水摩擦性＞
前記＜ベタ印刷包装材の作製>の試験片を、学振式堅牢度試験機（ＡＢ-３０１、テスター産業（株）製）を用いて、ＪＩＳ-P８１３６に準じて荷重５００ｇで５０往復の摩擦試験を行った。その結果、摩擦紙の汚れ状態を汚染用グレースケールと比較して、汚れのないものを５として５段階評価し、その結果を表３に示した。なお、耐水摩擦性の試験では、綿布に水を含ませたものを用いた。
<Abrasion resistance and water resistance>
Using the Gakken type fastness tester (AB-301, manufactured by Tester Sangyo Co., Ltd.), the test piece of <Preparation of solid printing packaging material> was subjected to 50 reciprocating frictions with a load of 500 g according to JIS-P8136. A test was conducted. As a result, the dirt state of the friction paper was compared with the gray scale for pollution, and the five grades were evaluated with 5 being no dirt, and the results are shown in Table 3. In the water friction resistance test, a cotton cloth soaked with water was used.
＜密着性＞
前記＜ベタ印刷包装材の作製>の試験片を、セロハン粘着テープ（ニチバン（株）製 ＣＴ４０５AP-１８）を印刷面に押し付けた後、そのセロハン粘着テープを剥がしたとき、テープ側にインキがほとんど取られていない場合を○、一部取られた場合を△、取られた場合を×として評価し、その結果を表３に示した。
<Adhesion>
When the cellophane adhesive tape (CT405AP-18 manufactured by Nichiban Co., Ltd.) was pressed against the printing surface of the test piece of <Preparation of solid printing packaging material>, the cellophane adhesive tape was peeled off. The case where it was not taken was evaluated as ◯, the case where it was partly taken as Δ, and the case where it was taken as x, and the results are shown in Table 3.
表３から、各々実施例１〜４のインキを用いて作製されたサンプル１〜４では、優れた耐摩擦性及び耐水摩擦性を示し、密着性もほぼ良好である。一方、ポリエチレンワックスを使用していないサンプル６及びコロイダルシリカを使用していないサンプル７では、何れも耐摩擦性及び耐水摩擦性が低下していることが分かる。
また、サンプル８のようにアルミニウム含量が２０％を越えるインキを用いたり、サンプル１０のようにリーフィングタイプのアルミニウムペーストを用いたり、サンプル１１のように粒子径の大きなアルミニウムペーストを用いたりした場合は、耐摩擦性、耐水摩擦性に加え密着性が低下していることが分かる。
From Table 3, Samples 1 to 4 produced using the inks of Examples 1 to 4 show excellent friction resistance and water friction resistance, respectively, and the adhesion is almost good. On the other hand, it can be seen that Sample 6 that does not use polyethylene wax and Sample 7 that does not use colloidal silica both have reduced friction resistance and water friction resistance.
In addition, when an ink having an aluminum content exceeding 20% is used as in Sample 8, a leafing type aluminum paste is used as in Sample 10, or an aluminum paste having a large particle diameter as in Sample 11 is used. In addition to the friction resistance and water friction resistance, it can be seen that the adhesion is reduced.
＜官能試験＞
前記＜ベタ印刷包装材の作製＞で作製した包装材料を用いて１リットル入り紙パック容器を組立て、これに成分無調整牛乳を充填し密封した。この牛乳入り密閉紙容器を店頭のショーウィンドー型冷蔵庫内に１週間保管し、パネラー３名がその味、においの変化を評価し、その平均値を表４に示した。なお、保存中の冷蔵庫内の庫内温度は４〜８℃で、店内及びショーウィンドーの蛍光灯が連続して点灯している状態であった。
３： 味及びにおいに殆ど変化がない。
２： 味及びにおいにわずかに変化が感じられる。
１： 明らかに味及びにおいに変化が感じられる。
<Sensory test>
Using the packaging material produced in <Preparation of solid printing packaging material>, a 1-liter paper pack container was assembled, and this was filled with non-component milk and sealed. This sealed paper container containing milk was stored in a shop window refrigerator for one week, and three panelists evaluated changes in taste and smell. The average values are shown in Table 4. The temperature inside the refrigerator during storage was 4 to 8 ° C., and the fluorescent lamps in the store and the show window were continuously lit.
3: Little change in taste and smell.
2: A slight change in taste and smell is felt.
1: Obvious changes in taste and odor.
表４から、サンプル１〜３、６及び７のように、イソプロピルアルコール中に分散したアルミニウムペーストを用いた場合は、何れも、味及びにおいの変化が無いか小さいが、ミネラルスピリットに分散したアルミニウムペーストを用いたサンプル８〜１１、青色印刷のサンプル１３、黄色印刷のサンプル１４及び無地原紙のサンプル１６では、味及びにおいの変化が大きいことが分かる。また、サンプル５のように、イソプロピルアルコール中に分散したアルミニウムペーストを用いてもアルミニウム含量が１０％未満の場合は、味及びにおいの変化が大きい。さらに、サンプル１及びサンプル１３〜１６の光透過率とそれらの味及びにおいの変化の大きさとを比較検討すると、光透過率の大きなサンプル１３〜１６では味及びにおいの変化が大きいが、光透過率の小さなサンプル１では、その変化が無かった。 From Table 4, when using aluminum paste dispersed in isopropyl alcohol, as in Samples 1-3, 6 and 7, all have little or no change in taste and odor, but aluminum dispersed in mineral spirits It can be seen that Samples 8 to 11 using the paste, Sample 13 for blue printing, Sample 14 for yellow printing, and Sample 16 for plain base paper have large changes in taste and odor. Further, as in Sample 5, even when an aluminum paste dispersed in isopropyl alcohol is used, if the aluminum content is less than 10%, the change in taste and odor is large. Further, when comparing the light transmittance of Sample 1 and Samples 13 to 16 with the magnitude of the change in taste and odor, the samples 13 to 16 having a large light transmittance have large changes in taste and odor, but the light transmission is large. There was no change in Sample 1 with a low rate.
＜意匠性の評価試験＞
前記＜ベタ印刷包装材の作製＞で作製した包装材料の意匠性を輝度及び隠蔽性により評価した。輝度については、当該包装材料の輝き具合が良好に見えるものを○、不良を×として評価し、隠蔽性については、同じく当該包装材料を室内で蛍光灯の光にかざして見たとき、抜けや透けがないものを○、少ないものを△、多いものを×として評価した。その結果を表５に示した。
<Evaluation test for designability>
The design property of the packaging material produced in <Preparation of solid printing packaging material> was evaluated based on luminance and concealment. For brightness, the case where the shine of the packaging material looks good is evaluated as ○, and the defect is evaluated as X, and the concealment property is the same as when the packaging material is viewed indoors over the light of a fluorescent lamp. Evaluations were made with ○ being transparent, Δ being less, and × being more. The results are shown in Table 5.
＜金属探知機試験＞
前記＜官能試験＞で組立てた紙パック容器を用いて、飲料等の生産ラインに設置されている金属探知機による金属反応の確認試験を行った結果、何れにおいても金属反応を示さなかった。これにより、本発明の包装容器は、包装容器自体が金属探知機に反応しないことによって、本来、金属探知機に反応すべき金属異物の検知に支障を及ぼさないことが確認できた。
<Metal detector test>
As a result of conducting a metal reaction confirmation test using a metal detector installed in a production line for beverages, etc., using the paper pack container assembled in the above <Sensory test>, no metal reaction was shown. As a result, it was confirmed that the packaging container of the present invention does not interfere with the detection of the metal foreign object that should react with the metal detector because the packaging container itself does not react with the metal detector.
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| JP2012122043A (en) * | 2010-12-07 | 2012-06-28 | Hokuetsu Package Kk | Shading silver ink composition and packaging container using the same |
| JP2019051992A (en) * | 2017-09-14 | 2019-04-04 | 大日本印刷株式会社 | Packaging material for microwave oven, packaging container for microwave oven and lid body for microwave oven |
| JP2019131288A (en) * | 2018-01-31 | 2019-08-08 | 大日本印刷株式会社 | Packaging material, packaging container and lid body |
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