JP2013230860A

JP2013230860A - Package film and method of producing the same

Info

Publication number: JP2013230860A
Application number: JP2012104580A
Authority: JP
Inventors: Takayoshi Matsui; 孝悦松井; Hiroshi Yamashita; 洋山下
Original assignee: DAISAN SHIGYO KK
Current assignee: DAISAN SHIGYO KK
Priority date: 2012-05-01
Filing date: 2012-05-01
Publication date: 2013-11-14

Abstract

PROBLEM TO BE SOLVED: To provide a package film produced using an existing printer and improved in identification of a package bag.SOLUTION: When a package film is formed into a package bag, a second surface printed portion 4 positioned on the surface of the package bag 7, is formed rough so that the second surface printed portion has roughness to touch which is different from that of the surface of a base material film 2 and a first surface printed portion 3, so that the bag is identified through looking or touching the surface of the package bag 7. The identification of the package bag 7 is improved by the second printed portion 4 besides a back side printed portion 5 identified through the base material film 2. The second front printed portion 4 is provided parallel to the first surface printed portion 3 in the direction of a roll shaft, so that when the package film 1 is held to be rolled on the roll shaft, a difference in level between the second surface printed portion 4 and the base material film 2 is eliminated by the first surface printed portion 3, and a film roll taken up is prevented from causing failure such as wrinkles. Thus the package film is produced using the existing printer.

Description

本発明は包装用フィルム及びその製造方法に関し、特に既存の印刷装置を用いて製造できると共に、包装袋の識別性を向上できる包装用フィルム及びその製造方法に関するものである。 The present invention relates to a packaging film and a method for producing the same, and more particularly to a packaging film capable of being produced using an existing printing apparatus and capable of improving the distinguishability of a packaging bag and a method for producing the same.

従来より、化学薬品、食品、医薬品等を収納するための包装袋として、合成樹脂製の包装用フィルムをヒートシールによって製袋したものが広く用いられている（特許文献１）。特許文献１に開示される包装用フィルムは、基材フィルムの裏面に印刷装置により文字や図柄等が印刷され、基材フィルムの裏面がシーラント層で覆われている。包装用フィルムは、ロール状に巻き取られた巻取りロールの姿で提供され、製袋装置によってシーラント層同士がヒートシールされて製袋される。この製袋された包装袋に化学薬品、食品、医薬品等が収納され密封される。基材フィルムに印刷された文字や図柄等が包装袋の内側に位置するので、基材フィルムを通して包装袋の表面から文字や図柄等を見ることができる。これにより包装袋の識別性を確保できる。 2. Description of the Related Art Conventionally, as a packaging bag for storing chemicals, foods, pharmaceuticals, etc., a bag made of synthetic resin packaging film by heat sealing has been widely used (Patent Document 1). In the packaging film disclosed in Patent Document 1, characters, designs, and the like are printed on the back surface of the base film by a printing device, and the back surface of the base film is covered with a sealant layer. The packaging film is provided in the form of a take-up roll wound up in a roll shape, and the sealant layers are heat-sealed by a bag making apparatus to form a bag. Chemicals, foods, pharmaceuticals, and the like are stored and sealed in the packaged bags. Since characters, designs, etc. printed on the base film are located inside the packaging bag, the characters, designs, etc. can be seen from the surface of the packaging bag through the base film. Thereby, the distinguishability of the packaging bag can be ensured.

特開２００５−１３８８７４号公報JP 2005-138874 A

しかしながら上記従来の技術において、基材フィルムを通して包装袋の表面から見える文字や図柄だけでなく、包装袋の識別性をより高めたいという要望があった。 However, in the above-described conventional technique, there is a demand for improving not only the characters and designs visible from the surface of the packaging bag through the base film but also the distinguishability of the packaging bag.

本発明は、上述した要望に応えるためになされたものであり、既存の印刷装置を用いて製造できると共に、包装袋の識別性を向上できる包装用フィルム及びその製造方法を提供することを目的としている。 The present invention has been made in order to meet the above-described demands, and an object thereof is to provide a packaging film that can be manufactured using an existing printing apparatus and that can improve the distinguishability of a packaging bag, and a method for manufacturing the same. Yes.

Means for Solving the Problems and Effects of the Invention

この目的を達成するために請求項１記載の包装用フィルムによれば、合成樹脂製の基材フィルムの裏面にシーラント層が積層形成されロール軸に巻回状に保持されるものであり、基材フィルムの裏面に印刷形成された裏刷部がシーラント層で覆われている。裏刷部が形成される基材フィルムの裏面の反対面となる表面の所定の領域に、所定の膜厚で第１表刷部が印刷形成される。その第１表刷部とは異なる領域であって第１表刷部とロール軸方向に並設される所定の領域に、第１表刷部より大きい膜厚の第２表刷部が凹凸状に印刷形成される。第２表刷部は、基材フィルムの表面および第１表刷部とは異なる手触りとなる表面粗さを有している。 In order to achieve this object, according to the packaging film of claim 1, a sealant layer is formed on the back surface of the base film made of synthetic resin and is held in a wound shape on a roll shaft. The back printing part printed and formed on the back surface of the material film is covered with a sealant layer. The first front printing portion is printed and formed with a predetermined film thickness in a predetermined region on the surface opposite to the back surface of the base film on which the back printing portion is formed. The second front printing portion having a thickness larger than that of the first front printing portion is uneven in a predetermined region which is different from the first front printing portion and is arranged in parallel with the first front printing portion in the roll axis direction. Is formed by printing. The second front printing portion has a surface roughness that is different from the surface of the base film and the first front printing portion.

シーラント層のヒートシールにより包装用フィルムを製袋した場合には、第２表刷部は包装袋の表面に位置する。第２表刷部は、基材フィルムの表面および第１表刷部とは異なる手触りとなる表面粗さを有し凹凸状に形成されているので、視覚および触覚を通じて第２表刷部を認識できる。その結果、基材フィルムを通して包装袋の表面から見える裏刷部に加え、第２表刷部により包装袋の識別性を向上できる効果がある。 When the packaging film is made by heat sealing the sealant layer, the second front printing portion is located on the surface of the packaging bag. The second front printing part has a surface roughness that is different from the surface of the base film and the first front printing part, and is formed in an uneven shape, so that the second front printing part is recognized through visual and tactile senses. it can. As a result, in addition to the back printing part visible from the surface of the packaging bag through the base film, the second surface printing part has an effect of improving the identification of the packaging bag.

また、第２表刷部は、第１表刷部とは異なる領域であって第１表刷部とロール軸方向に並設される所定の領域に形成されており、第１表刷部は所定の膜厚で形成されている。第１表刷部により、第２表刷部と基材フィルムとの間の高低差を緩和できるので、包装用フィルムをロール軸に巻回状に保持するときに巻取りロールにシワ等の不具合が生じることを防止できる。これにより既存の印刷装置を用いて製造できる効果がある。 Further, the second front printing section is formed in a predetermined area that is different from the first front printing section and is arranged in parallel with the first front printing section in the roll axis direction. It is formed with a predetermined film thickness. Since the first front printing part can alleviate the height difference between the second front printing part and the base film, there is a problem such as wrinkles on the winding roll when the packaging film is wound around the roll shaft. Can be prevented. Thereby, there exists an effect which can be manufactured using the existing printing apparatus.

請求項２記載の包装用フィルムによれば、第１表刷部は、基材フィルムの表面とは異なる表面粗さを有する粗面状に形成されているので、包装用フィルムをロール軸に巻き取るときに、基材フィルムの表面に形成された第１表刷部と基材フィルムの裏面とを滑り難くできる。包装用フィルムを巻き取るときの基材フィルム間の摩擦力が低下すると、ロール軸の軸方向に基材フィルムが滑り易くなりスリップが生じやすくなるところ、粗面状に形成された第１表刷部により基材フィルム間の摩擦力が低下することを抑制できる。これにより請求項１の効果に加え、包装用フィルムをロール軸に巻き取るときに、包装用フィルムが蛇行することを防止できると共に、巻取りロールにスリップを生じ難くできる効果がある。 According to the packaging film of claim 2, since the first front printing portion is formed in a rough surface shape having a surface roughness different from the surface of the base film, the packaging film is wound around the roll shaft. When taking, the 1st surface printing part formed in the surface of a base film and the back surface of a base film can be made hard to slip. When the frictional force between the base films when winding the packaging film is reduced, the base film is easily slipped in the axial direction of the roll shaft, and slip easily occurs. It can suppress that the frictional force between base film falls by a part. Thus, in addition to the effect of the first aspect, when the packaging film is wound around the roll shaft, it is possible to prevent the packaging film from meandering and to prevent the winding roll from slipping.

請求項３記載の包装用フィルムによれば、シーラント層は基材フィルムのヒートシールにより封止部が形成されるものであり、第１表刷部および第２表刷部は、封止部が形成される基材フィルムの所定部を除く領域に少なくとも形成されている。そのため請求項１又は２に記載の効果に加え、封止部を形成するシールバーによって第１表刷部および第２表刷部を構成するインキが取れたり、取れたインキでシールバーが汚れたりする不具合を防止できる効果がある。 According to the packaging film of claim 3, the sealant layer has a sealing portion formed by heat sealing the base film, and the first front printing portion and the second front printing portion have a sealing portion. It is formed at least in a region excluding a predetermined portion of the base film to be formed. Therefore, in addition to the effect described in claim 1 or 2, the seal bar forming the sealing portion removes the ink constituting the first front printing portion and the second front printing portion, or the seal bar becomes dirty with the removed ink. This has the effect of preventing malfunctions.

請求項４記載の包装用フィルムの製造方法によれば、合成樹脂製の同一の基材フィルムに対して複数の版を用いてグラビア印刷により文字や図柄を印刷形成し、ロール軸に巻回状に保持するものであり、裏刷工程により基材フィルムの裏面に印刷パターンが形成され、その裏刷工程により印刷パターンが形成された基材フィルムの表面の所定の領域に、第２表刷部形成工程により凹凸状の印刷パターンが所定の膜厚で印刷され乾燥されて第２表刷部が形成される。その第２表刷部形成工程により形成された第２表刷部とは異なる領域であって第２表刷部とロール軸方向に並設される所定の領域に、第１表刷部形成工程により、第２表刷部より小さい膜厚で印刷パターンが印刷され乾燥されて第１表刷部が形成される。その第１表刷部形成工程により第１表刷部が形成された基材フィルムの裏面に積層工程によりシーラント層が積層形成される。第２表刷部形成工程により形成された第２表刷部は、基材フィルムの表面および第１表刷部とは異なる手触りとなる表面粗さを有しているので、製造された包装用フィルムは、請求項１と同様の効果がある。 According to the method for manufacturing a packaging film according to claim 4, characters and designs are printed and formed on the roll shaft by gravure printing using a plurality of plates on the same base film made of synthetic resin. The second surface printing portion is formed in a predetermined area on the surface of the base film on which the printing pattern is formed on the back surface of the base film by the back printing process and the printing pattern is formed by the back printing process. In the forming process, the uneven printed pattern is printed with a predetermined film thickness and dried to form the second front printing portion. The first front printing part forming step in a predetermined area that is different from the second front printing part formed by the second front printing part forming step and is arranged in parallel with the second front printing part in the roll axis direction. As a result, the print pattern is printed with a film thickness smaller than that of the second front printing portion and dried to form the first front printing portion. A sealant layer is laminated and formed on the back surface of the base film on which the first front printed portion is formed by the first front printed portion forming step. Since the 2nd surface printing part formed by the 2nd surface printing part formation process has the surface roughness used as the surface which is different from the surface of a base film, and the 1st surface printing part, it is for the manufactured packaging. The film has the same effect as that of the first aspect.

また、同一の基材フィルムに対して膜厚の大きな第２表刷部を印刷し乾燥した後、第２表刷部より膜厚の小さな第１表刷部を印刷し乾燥するので、第１表刷部を乾燥するときには第２表刷部を一緒に乾燥させることができる。第１表刷部より膜厚の大きな第２表刷部の乾燥時間を第１表刷部の乾燥時間より長くすることができるので、第２表刷部を形成するインキの乾燥不良（溶剤の残留やブロッキング）を防止できる効果がある。 Also, after printing and drying the second surface printing portion having a large film thickness on the same base film, the first surface printing portion having a smaller film thickness than the second surface printing portion is printed and dried. When the front printing portion is dried, the second front printing portion can be dried together. Since the drying time of the second front printing part having a film thickness larger than that of the first front printing part can be made longer than the drying time of the first front printing part, the drying failure of the ink (solvent of the solvent) forming the second front printing part can be increased. Residual and blocking) can be prevented.

請求項５記載の包装用フィルムの製造方法によれば、第２表刷部形成工程の第１印刷工程により、基材フィルムの表面の所定の領域にインキがパターン印刷されて乾燥され、その第１印刷工程により形成された印刷パターンの上に重ねて、第２印刷工程によりインキがパターン印刷され乾燥される。それら複数回のパターン印刷の重ね合わせにより第２表刷部が形成されるので、各々のパターン印刷の膜厚の合計を第２表刷部の膜厚とすることができる。第２表刷部を構成する各々のパターン印刷の膜厚を薄くして、各々の印刷パターンに含まれる溶剤を揮発させることができるので、請求項４の効果に加え、膜厚の大きな第２表刷部の乾燥不良を確実に防止できる効果がある。 According to the method for manufacturing a packaging film according to claim 5, the first printing step of the second front-printed portion forming step performs pattern printing of the ink on a predetermined region of the surface of the base film, and the drying, The ink is pattern-printed and dried by the second printing process on the printing pattern formed by the first printing process. Since the second front printing portion is formed by superposing these multiple times of pattern printing, the total thickness of each pattern printing can be made the film thickness of the second front printing portion. Since the film thickness of each pattern printing constituting the second front printing portion can be reduced and the solvent contained in each printing pattern can be volatilized, in addition to the effect of claim 4, There is an effect that it is possible to reliably prevent poor drying of the front printing part.

請求項６記載の包装用フィルムの製造方法によれば、第１印刷工程により形成される印刷パターンの面積より小さい面積の突起状の印刷パターンが第２印刷工程により形成されるので、第１印刷工程により印刷されたインキに残留する溶剤を、第２印刷工程により形成された印刷パターンの間から揮発させ易くすることができる。これにより請求項５の効果に加え、第２表刷部の残留溶剤をさらに減らすことができる効果がある。また、第１印刷工程により形成される印刷パターンに重ねて、第２印刷工程により突起状の印刷パターンが形成されるので、第２表刷部の凹凸感を強調できる効果がある。 According to the method for manufacturing a packaging film according to claim 6, since the protruding printing pattern having an area smaller than the area of the printing pattern formed by the first printing process is formed by the second printing process, the first printing is performed. It is possible to easily volatilize the solvent remaining in the ink printed by the process from between the print patterns formed by the second printing process. Thus, in addition to the effect of the fifth aspect, there is an effect that the residual solvent in the second front printing portion can be further reduced. In addition, since the protruding printing pattern is formed by the second printing step so as to overlap the printing pattern formed by the first printing step, there is an effect that the unevenness of the second front printing portion can be emphasized.

（ａ）は第１実施の形態における包装用フィルムの平面図であり、（ｂ）はロール軸方向と直交する平面で切断された包装用フィルムの平面図である。(A) is a top view of the packaging film in 1st Embodiment, (b) is a top view of the packaging film cut | disconnected by the plane orthogonal to a roll axial direction. （ａ）は図１（ｂ）のＩＩ−ＩＩ線における包装用フィルムの模式断面図であり、（ｂ）は図２（ａ）の破線で囲まれた部分を拡大して示す包装用フィルムの拡大図である。(A) is a schematic cross section of the packaging film taken along the line II-II in FIG. 1 (b), and (b) is an enlarged view of the packaging film shown in FIG. 2 (a) surrounded by the broken line. It is an enlarged view. （ａ）は包装袋の平面図であり、（ｂ）は包装袋の底面図である。(A) is a top view of a packaging bag, (b) is a bottom view of a packaging bag. 包装用フィルムを製造する印刷装置の構成を模式的に示した構成図である。It is the block diagram which showed typically the structure of the printing apparatus which manufactures the film for packaging. （ａ）は第２実施の形態における包装用フィルムの製造途中の形態を示すロール軸方向における模式断面図であり、（ｂ）はロール軸方向における包装用フィルムの模式断面図であり、（ｃ）は図４（ｂ）のＩＶｃ−ＩＶｃ線における包装用フィルムの模式断面図である。(A) is a schematic cross section in the roll-axis direction which shows the form in the middle of manufacture of the packaging film in 2nd Embodiment, (b) is a schematic cross-sectional view of the packaging film in a roll-axis direction, (c ) Is a schematic cross-sectional view of the packaging film taken along line IVc-IVc in FIG.

以下、本発明の好ましい実施の形態について添付図面を参照して説明する。まず図１を参照して、第１実施の形態における包装用フィルムについて説明する。図１（ａ）は第１実施の形態における包装用フィルム１の平面図であり、図１（ｂ）はロール軸方向と直交する平面で切断された包装用フィルム１の平面図である。図１（ａ）に示すように包装用フィルム１は、文字や図柄等が印刷された印刷領域Ｐが基材フィルム２に複数配列されている。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG. 1, the packaging film in 1st Embodiment is demonstrated. Fig.1 (a) is a top view of the packaging film 1 in 1st Embodiment, FIG.1 (b) is a top view of the packaging film 1 cut | disconnected by the plane orthogonal to a roll axial direction. As shown in FIG. 1A, the packaging film 1 has a plurality of print areas P on which characters, designs, and the like are printed, arranged on the base film 2.

基材フィルム２は合成樹脂製の軟包装資材であり、ポリエチレン系樹脂、ポリプロピレン系樹脂、環状ポリオレフィン系樹脂、フッ素系樹脂、ポリスチレン系樹脂、アクリロニトリル−スチレン共重合体（ＡＳ樹脂）、アクリロニトリル−ブタジエン−スチレン共重合体（ＡＢＳ樹脂）、ポリ塩化ビニル系樹脂、フッ素系樹脂、ポリ（メタ）アクリル系樹脂、ポリカーボネート系樹脂、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系樹脂、各種のナイロン等のポリアミド系樹脂、ポリイミド系樹脂、ポリアミドイミド系樹脂、ポリアリールフタレート系樹脂、シリコーン系樹脂、ポリスルホン系樹脂、ポリフェニレンスルフィド系樹脂、ポリエーテルスルホン系樹脂、ポリウレタン系樹脂、アセタール系樹脂、セルロース系樹脂など各種の合成樹脂の１種または複数種により製膜された透明または半透明のフィルムが用いられる。特に耐熱性、耐油性および防湿性に優れるポリプロピレン系樹脂、なかでも透明性および光沢に優れると共に引張弾性率の大きな二軸延伸ポリプロピレン系樹脂が好適に用いられる。 The base film 2 is a soft packaging material made of synthetic resin, such as polyethylene resin, polypropylene resin, cyclic polyolefin resin, fluorine resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene. -Styrene copolymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, and polyamides such as various nylons Resin, polyimide resin, polyamideimide resin, polyarylphthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, acetal resin, Cellulose-based various transparent or semi-transparent film formed as a film by one or more synthetic resins, such as resin. In particular, a polypropylene resin excellent in heat resistance, oil resistance and moisture resistance, and in particular, a biaxially stretched polypropylene resin excellent in transparency and gloss and having a large tensile elastic modulus is preferably used.

印刷領域Ｐは、包装用フィルム１により作られる包装袋に収容される製品（内容物）に応じて、文字、記号、表、バーコード、画像、マーク、模様、背景などの種々のパターンが印刷される領域である。印刷領域Ｐは、包装用フィルム１の長手方向（図１（ａ）上下方向）及び短手方向（図１（ａ）左右方向）に複数が規則正しく配列されている。 In the printing area P, various patterns such as characters, symbols, tables, barcodes, images, marks, patterns, and backgrounds are printed according to the products (contents) contained in the packaging bag made of the packaging film 1. It is an area to be A plurality of printing regions P are regularly arranged in the longitudinal direction (FIG. 1 (a) vertical direction) and the short direction (FIG. 1 (a) horizontal direction) of the packaging film 1.

図１（ｂ）に示すように包装用フィルム１は、ロール軸方向（図１（ａ）左右方向）と直交する平面で、印刷領域Ｐより幅広に切断され複数に分割される。分割された包装用フィルム１は、ハンドリングを容易にするため、ロール軸（図示せず）の周りに巻回状に保持され、巻取りロールが作られる。印刷領域Ｐは、ロール軸方向（図１（ｂ）左右方向）と直交する方向に所定の間隔をあけて複数配列されている。包装用フィルム１は印刷領域Ｐ毎に切断線ｃにより切り離されて、後述する包装袋７（図３参照）が製造される。 As shown in FIG. 1B, the packaging film 1 is cut into a plurality of widths from the printing region P on a plane orthogonal to the roll axis direction (left and right direction in FIG. 1A). In order to facilitate handling, the divided packaging film 1 is held around a roll shaft (not shown) in a wound shape, and a winding roll is made. A plurality of print areas P are arranged at predetermined intervals in a direction orthogonal to the roll axis direction (left-right direction in FIG. 1B). The packaging film 1 is cut by the cutting line c for each printing region P, and a packaging bag 7 (see FIG. 3) described later is manufactured.

包装用フィルム１は、各々の印刷領域Ｐにおいて、基材フィルム２の表面（図１（ｂ）紙面手前側）に第１表刷部３及び第２表刷部４が形成されている。第１表刷部３は、基材フィルム２の表面の所定の領域に所定の膜厚で形成されており、第２表刷部４は、第１表刷部３とは異なる領域であって第１表刷部３とロール軸方向（図１（ｂ）左右方向）に並設される所定の領域に形成されている。第１表刷部３及び第２表刷部４と基材フィルム２の側縁との間には、第１表刷部３及び第２表刷部４が印刷されていない余白２ａが形成されている。また、第１表刷部３及び第２表刷部４と切断線ｃとの間には、第１表刷部３及び第２表刷部４が印刷されていない余白２ｂが形成されている。 In each printing region P, the packaging film 1 has a first front printing portion 3 and a second front printing portion 4 formed on the surface of the base film 2 (the front side in FIG. 1B). The first front printing unit 3 is formed in a predetermined region on the surface of the base film 2 with a predetermined film thickness, and the second front printing unit 4 is a region different from the first front printing unit 3. It is formed in a predetermined region arranged in parallel with the first front printing portion 3 and the roll axis direction (left and right direction in FIG. 1B). A margin 2a where the first front printing unit 3 and the second front printing unit 4 are not printed is formed between the first front printing unit 3 and the second front printing unit 4 and the side edge of the base film 2. ing. Further, a margin 2b on which the first front printing unit 3 and the second front printing unit 4 are not printed is formed between the first front printing unit 3 and the second front printing unit 4 and the cutting line c. .

図２を参照して、包装用フィルム１についてさらに説明する。図２（ａ）は図１（ｂ）のＩＩ−ＩＩ線における包装用フィルム１の模式断面図であり、図２（ｂ）は図２（ａ）の破線で囲まれた部分を拡大して示す包装用フィルム１の拡大図である。 The packaging film 1 will be further described with reference to FIG. 2A is a schematic cross-sectional view of the packaging film 1 taken along the line II-II in FIG. 1B, and FIG. 2B is an enlarged view of the portion surrounded by the broken line in FIG. It is an enlarged view of the packaging film 1 shown.

図２（ａ）に示すように、包装用フィルム１はロール軸方向（図２（ａ）左右方向）において、余白２ａの内側に第１表刷部３及び第２表刷部４が形成されている。本実施の形態では、第１表刷部３は３〜１０μｍの膜厚で、表面に微細な凹凸を有する粗面状（マット状ないしは梨地状）に形成されている。 As shown in FIG. 2 (a), the packaging film 1 has the first front printing part 3 and the second front printing part 4 formed inside the margin 2a in the roll axis direction (FIG. 2 (a) left-right direction). ing. In the present embodiment, the first front printing portion 3 has a film thickness of 3 to 10 μm, and is formed in a rough surface shape (matt or satin shape) having fine irregularities on the surface.

第２表刷部４は、第１表刷部３の膜厚より大きい所定の膜厚で印刷形成される部位である。第２表刷部４は、第１表刷部３及び基材フィルム２の表面とは異なる手触りとなる表面粗さを有する凹凸状に形成されており、本実施の形態では、膜厚が１０〜３０μｍに形成されている。なお、第２表刷部４は、図２（ｂ）に示すようにロール軸方向（図２（ｂ）左右方向）に互いに所定の間隔をあけてロール軸方向と直交する方向（図２（ｂ）紙面垂直方向）に延びる突条状に形成されている。突条状に形成された第２表刷部４の相互の間隔は０．２〜１ｍｍ程度に形成されている。 The second front printing portion 4 is a portion that is printed and formed with a predetermined film thickness that is larger than the film thickness of the first front printing portion 3. The second front printing portion 4 is formed in a concavo-convex shape having a surface roughness that is different from the surface of the first front printing portion 3 and the base film 2. In this embodiment, the film thickness is 10 It is formed to ˜30 μm. As shown in FIG. 2 (b), the second front printing unit 4 has a predetermined interval in the roll axis direction (left / right direction in FIG. 2 (b)) and a direction perpendicular to the roll axis direction (FIG. 2 (b)). b) It is formed in a ridge shape extending in the direction perpendicular to the paper surface. The interval between the second front printing portions 4 formed in a ridge shape is formed to be about 0.2 to 1 mm.

なお、第１表刷部３及び第２表刷部４は、淡色インキにより形成することが好ましい。基材フィルム２の裏面に形成された裏刷部５を、第１表刷部３、第２表刷部４及び基材フィルム２を通して視認可能にするためである。 In addition, it is preferable to form the 1st front printing part 3 and the 2nd front printing part 4 with light color ink. This is because the back printing portion 5 formed on the back surface of the base film 2 is visible through the first front printing portion 3, the second front printing portion 4 and the base film 2.

図２（ａ）に戻って説明する。包装用フィルム１は、基材フィルム２の裏面に裏刷部５が印刷形成されている。裏刷部５は、文字、記号、表、バーコード、画像、マーク、模様、背景などの種々のパターンが印刷される部位であり、いずれかの顔料による単色印刷または複数の顔料を使用した多色印刷を採用することが可能である。また、基材フィルム２の裏面の部分印刷または全面印刷のいずれを採用することも可能である。 Returning to FIG. The packaging film 1 has a back printing portion 5 printed on the back surface of the base film 2. The back printing unit 5 is a part where various patterns such as characters, symbols, tables, barcodes, images, marks, patterns, and backgrounds are printed, and a single color printing using any one of the pigments or multiple printing using a plurality of pigments. Color printing can be employed. Moreover, it is also possible to employ | adopt either partial printing of the back surface of the base film 2, or full surface printing.

裏刷部５が形成された基材フィルム２の裏面には、シーラント層６が形成されている。シーラント層６は、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、直鎖状（線状）低密度ポリエチレン、ポリプロピレン、無延伸ポリプロピレン、エチレン−酢酸ビニル共重合体、アイオノマー樹脂、エチレン−アクリル酸共重合体、エチレン−アクリル酸エチル共重合体、エチレン−メタクリル酸共重合体、メタロセン触媒を使用して重合したエチレン−オレフィン共重合体、ポリプロピレン、エチレン−メタクリル酸メチル共重合体、エチレン−プロピレン共重合体、メチルペンテンポリマー、ポリブテンポリマー、ポリエチレンまたはポリプロピレン等のポリオレフィン系樹脂をアクリル酸、メタクリル酸、マレイン酸、無水マレイン酸、フマール酸、イタコン酸等の不飽和カルボン酸で変性した酸変性ポリオレフィン樹脂、ポリ酢酸ビニル系樹脂、ポリ（メタ）アクリル系樹脂、ポリ塩化ビニル系樹脂等の樹脂からなる１種以上のフィルム又は塗布膜などを使用することができる。特に、ヒートシール性、耐熱性、防湿性および柔軟性に優れる無延伸ポリプロピレン系樹脂が好適に用いられる。なお、シーラント層６は、基材フィルム２との間に接着剤を塗布した後、ラミネート積層法により接着させることができる。 A sealant layer 6 is formed on the back surface of the base film 2 on which the back printing portion 5 is formed. The sealant layer 6 is composed of low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, unstretched polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer. Polymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-olefin copolymer polymerized using metallocene catalyst, polypropylene, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer An acid-modified polyolefin obtained by modifying a polyolefin resin such as a polymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid or itaconic acid. Down resins, polyvinyl acetate resins, poly (meth) acrylic resin, one or more films made of a resin such as polyvinyl chloride resin or the coating film and the like can be used. In particular, an unstretched polypropylene resin excellent in heat sealability, heat resistance, moisture resistance and flexibility is preferably used. The sealant layer 6 can be adhered by a laminate lamination method after applying an adhesive to the base film 2.

次に図３を参照して、包装用フィルム１により形成される包装袋７について説明する。図３（ａ）は包装袋７の平面図であり、図３（ｂ）は包装袋７の底面図である。図３（ａ）及び図３（ｂ）に示すように、包装袋７は包装用フィルム１の合掌貼りにより製造される。 Next, the packaging bag 7 formed by the packaging film 1 will be described with reference to FIG. FIG. 3A is a plan view of the packaging bag 7, and FIG. 3B is a bottom view of the packaging bag 7. As shown in FIG. 3A and FIG. 3B, the packaging bag 7 is manufactured by gluing the packaging film 1 together.

具体的には、印刷領域Ｐ（図１（ｂ）参照）の周りに余白２ａ，２ｂを設けて包装用フィルム１を所定の矩形状に切断した後、余白２ａを互いに近づけるように包装用フィルム１を外表にして折り曲げる。次に、折り曲げられた余白２ｂの表面をシールバー（図示せず）によって押圧し、余白２ｂの裏面同士（シーラント層６）をヒートシールすることにより上貼り部８ａ及び下貼り部８ｂを形成する。そして、余白２ａの表面をシールバーによって押圧し、余白２ａの裏面同士（シーラント層６）をヒートシールすることにより背貼り部８ｃを形成する。これにより上端部および下端部にそれぞれ一定幅の帯状に形成された上貼り部８ａ及び下貼り部８ｂと、これら上貼り部８ａ及び下貼り部８ｂを繋ぐように形成された背貼り部８ｃとを備える封止部８によって密封された合掌貼りタイプの包装袋７を得ることができる。 Specifically, the packaging film 1 is provided so that the margins 2a and 2b are provided around the printing region P (see FIG. 1B), the packaging film 1 is cut into a predetermined rectangular shape, and the margins 2a are brought close to each other. Bend with 1 facing out. Next, the surface of the bent margin 2b is pressed with a seal bar (not shown), and the back surfaces (sealant layer 6) of the margin 2b are heat sealed to form the upper pasting portion 8a and the lower pasting portion 8b. . And the back sticking part 8c is formed by pressing the surface of the margin 2a with a seal bar, and heat-sealing the back surfaces (sealant layer 6) of the margin 2a. As a result, an upper pasting portion 8a and a lower pasting portion 8b formed in a band shape having a constant width at the upper end portion and the lower end portion, respectively, and a back pasting portion 8c formed so as to connect the upper pasting portion 8a and the lower pasting portion 8b, It is possible to obtain a palm-attached type packaging bag 7 that is sealed by a sealing portion 8 that includes

以上のように包装袋７は、包装用フィルム１の表面からのヒートシールにより封止部８が形成されるものであり、包装用フィルム１は、封止部８が形成される余白２ａ，２ｂを除く印刷領域Ｐに第１表刷部３及び第２表刷部４が形成されている。そのため、封止部８を形成するシールバー（図示せず）によって第１表刷部３及び第２表刷部４を構成するインキが取れたり、取れたインキでシールバーが汚れたりする不具合を防止できる。 As described above, the packaging bag 7 has the sealing portion 8 formed by heat sealing from the surface of the packaging film 1, and the packaging film 1 has blanks 2 a and 2 b in which the sealing portion 8 is formed. The first front printing unit 3 and the second front printing unit 4 are formed in the printing region P excluding the area. Therefore, the seal bar (not shown) that forms the sealing portion 8 can remove the ink that constitutes the first front printing portion 3 and the second front printing portion 4, and the sealing bar can be stained with the removed ink. Can be prevented.

また、包装袋７は包装用フィルム１のシーラント層６のヒートシールによって製袋されるので、第２表刷部４は包装袋７の表面に位置する。第２表刷部４は、基材フィルム２の表面および第１表刷部３とは異なる手触りとなる表面粗さを有し凹凸状に形成されているので、視覚および触覚を通じて認識される。その結果、基材フィルム２を通して包装袋７の表面から見える裏刷部５に加え、第２表刷部４により包装袋７の識別性を向上できる。 Further, since the packaging bag 7 is formed by heat sealing the sealant layer 6 of the packaging film 1, the second front printing portion 4 is located on the surface of the packaging bag 7. The second front printing portion 4 has a surface roughness different from that of the surface of the base film 2 and the first front printing portion 3 and is formed in a concavo-convex shape, and is thus recognized through vision and touch. As a result, the discriminability of the packaging bag 7 can be improved by the second front printing unit 4 in addition to the back printing unit 5 visible from the surface of the packaging bag 7 through the base film 2.

また、第１表刷部３及び第２表刷部４が淡色インキで形成されている場合には、第１表刷部３及び第２表刷部４を通して裏刷部５を識別可能にできる。これにより、第１表刷部３及び第２表刷部４は裏刷部５と相まって識別性を高めることができる。例えば、包装袋７の内容物が「食品」である場合には、包装袋７の底面（図３（ｂ）参照）に現れる第２表刷部４を通して、「食品」の原材料名、調理方法等を識別可能にできる。 Further, when the first front printing unit 3 and the second front printing unit 4 are formed of light color ink, the back printing unit 5 can be identified through the first front printing unit 3 and the second front printing unit 4. . As a result, the first front printing unit 3 and the second front printing unit 4 can be improved in distinguishability together with the back printing unit 5. For example, when the content of the packaging bag 7 is “food”, the name of the raw material of “food”, the cooking method is passed through the second printing section 4 that appears on the bottom surface of the packaging bag 7 (see FIG. 3B). Etc. can be identified.

また、包装袋７に「おにぎり」が収容される場合には、「おにぎり」を包む「竹の皮」の画像を裏刷部５に表示し、第２表刷部４により「竹の皮」の表面の凹凸を表すことができる。その結果、裏刷部５及び第２表刷部４により「竹の皮」の表面のざらざら感を立体的に表現し、視覚および触覚に訴えるようにできる。これにより、包装袋７の識別性を向上させ、包装袋７の内容物の訴求性を高めることができる。このように包装袋７の内容物を連想させる裏刷部５の画像を選択し、その裏刷部５の画像に応じて第２表刷部４の凹凸の高さ及び間隔を適宜設定することにより、包装袋７の内容物に応じた識別性を向上させることができる。 When “rice ball” is stored in the packaging bag 7, an image of “bamboo skin” wrapping the “rice ball” is displayed on the back printing unit 5, and the “bamboo skin” is displayed by the second surface printing unit 4. The unevenness of the surface can be expressed. As a result, the back printing unit 5 and the second front printing unit 4 can express the rough feeling of the surface of the “bamboo skin” in three dimensions and appeal to visual and tactile sensations. Thereby, the distinguishability of the packaging bag 7 can be improved, and the appeal of the contents of the packaging bag 7 can be enhanced. In this way, the image of the back printing unit 5 that is reminiscent of the contents of the packaging bag 7 is selected, and the height and interval of the unevenness of the second front printing unit 4 are set appropriately according to the image of the back printing unit 5. Thereby, the discriminability according to the contents of the packaging bag 7 can be improved.

なお、第２表刷部４を淡色インキで形成するのではなく、濃色インクで形成することは当然可能である。第２表刷部４を濃色インクで形成する場合には、第２表刷部４を突条状または点状（ドット状）に互いに間隔をあけて設けることにより、第２表刷部４の間から基材フィルム２を通して裏刷部５を視認できる。この場合も、裏刷部５及び第２表刷部４により包装袋７の表面のざらざら感を立体的に表現することができる。 Of course, it is possible to form the second front printing portion 4 with dark ink instead of with light ink. In the case of forming the second front printing portion 4 with dark ink, the second front printing portion 4 is provided by providing the second front printing portion 4 in the form of ridges or dots (dots) spaced apart from each other. The back printing part 5 can be visually recognized through the base film 2 from between. Also in this case, the rough feeling of the surface of the packaging bag 7 can be three-dimensionally expressed by the back printing unit 5 and the second front printing unit 4.

また、第１表刷部３は、基材フィルム２の表面とは異なる表面粗さを有する粗面状（梨地状）に形成されているので、つや消し効果がある。第１表刷部３のつや消し効果によって、基材フィルム２の表面と見た目を異ならせることができ、包装袋７の識別性を向上できる。特に、第１表刷部３及び第２表刷部４に囲まれた方形状の部位（基材フィルム２の表面）との見た目の違いを際立たせることができる。 Moreover, since the 1st surface printing part 3 is formed in the rough surface shape (satin finish) which has a surface roughness different from the surface of the base film 2, it has a mat effect. The matte effect of the first front printing portion 3 can make the appearance different from the surface of the base film 2, and can improve the distinguishability of the packaging bag 7. In particular, the difference in appearance from the square-shaped portion (the surface of the base film 2) surrounded by the first front printing portion 3 and the second front printing portion 4 can be emphasized.

次に図４を参照して、包装用フィルム１の製造方法について説明する。図４は包装用フィルム１をグラビア印刷により製造する印刷装置１０の構成を模式的に示した構成図である。印刷装置１０は、薄膜状に構成された基材フィルム２が巻回状に保持する供給ローラ１１と、所定の印刷が施された基材フィルム２を巻き取り巻回状に保持する巻取ローラ１７と、印刷パターンが凹状の溝で外周面に形成されると共に版胴モータ（図示せず）により回転駆動する版胴１４ａ〜１４ｅと、この版胴１４ａ〜１４ｅの外周面それぞれにインキを供給するインキ容器１５ａ〜１５ｅと、版胴１４ａ〜１４ｅの外周面に供給された余分なインキを掻き落とすドクタ１６ａ〜１６ｅと、版胴１４ａ〜１４ｅに基材フィルム２をそれぞれ押し付けると共にその版胴１４ａ〜１４ｅの回転に連動して回転する圧胴１３ａ〜１３ｅと、その圧胴１３ａ〜１３ｅにより基材フィルム２が版胴１４ａ〜１４ｅに押し付けられることによって基材フィルム２に転移したインキを乾燥する乾燥機１８ａ〜１８ｅとを主に備えている。 Next, with reference to FIG. 4, the manufacturing method of the film 1 for packaging is demonstrated. FIG. 4 is a configuration diagram schematically showing the configuration of a printing apparatus 10 that manufactures the packaging film 1 by gravure printing. The printing apparatus 10 includes a supply roller 11 that holds the base film 2 that is formed into a thin film in a winding shape, and a winding roller that holds the base film 2 on which a predetermined printing has been performed in a winding shape. 17 and a printing pattern is formed on the outer peripheral surface by a concave groove, and ink is supplied to each of the outer peripheral surfaces of the plate cylinders 14a to 14e rotated by a plate cylinder motor (not shown) and the plate cylinders 14a to 14e. The ink containers 15a to 15e, the doctors 16a to 16e for scraping off the excess ink supplied to the outer peripheral surfaces of the plate cylinders 14a to 14e, and the base film 2 to the plate cylinders 14a to 14e, respectively, and the plate cylinder 14a The pressure drums 13a to 13e rotating in conjunction with the rotation of -14e, and the base film 2 is pressed against the plate cylinders 14a to 14e by the pressure drums 13a to 13e. A dryer 18a~18e drying metastasized ink Lum 2 mainly comprises.

追動ローラ１２ａ〜１２ｌは、版胴１４ａ〜１４ｅの回転駆動により搬送される基材フィルム２に追動して回転するローラであり、追動ローラ１２ａ〜１２ｌよって基材フィルム２は搬送される。供給ローラ１１から巻取ローラ１７への基材フィルム２の搬送経路内において、追動ローラ１２ｇと追動ローラ１２ｈとの間には反転装置１９が配設されている。反転装置１９は、版胴１４ａ〜１４ｃに基材フィルム２の裏面を相対させる一方で版胴１４ｄ〜１４ｅに基材フィルム２の表面を相対させるために、基材フィルム２の裏面と表面とを反転させる装置である。 The follower rollers 12a to 12l are rollers that are rotated by being driven by the base film 2 conveyed by the rotational drive of the plate cylinders 14a to 14e, and the base film 2 is conveyed by the follower rollers 12a to 12l. . A reversing device 19 is disposed between the follower roller 12 g and the follower roller 12 h in the conveyance path of the base film 2 from the supply roller 11 to the take-up roller 17. The reversing device 19 makes the back surface and the front surface of the base film 2 in order to make the back surface of the base film 2 relative to the plate cylinders 14d to 14e while making the back surface of the base film 2 relative to the plate cylinders 14a to 14c. It is a device to reverse.

版胴１４ａ〜１４ｃは裏刷部５（図２（ａ）参照）を印刷するための部材である。本実施の形態では、３つの版胴１４ａ〜１４ｃにより裏刷部５を印刷する場合について説明したが、必ずしもこれに限られるものではなく、印刷内容等に応じて版胴の数は適宜設定できる。通常は１〜８つの版胴により裏刷部５が印刷される。インキ容器１５ａ〜１５ｃには所定の色調の裏刷用のインキ（公知のグラビアインキ）が収容されている。インキは樹脂、溶剤および着色剤（顔料）を含有している。樹脂はポリウレタン系、アクリル系、塩化ゴム等を使用することができ、溶剤はトルエン、キシレン、ケトン類、酢酸エチル等の有機溶剤を使用することができる。水性インキを用いることも可能である。 The plate cylinders 14a to 14c are members for printing the back printing portion 5 (see FIG. 2A). In the present embodiment, the case where the back printing unit 5 is printed by the three plate cylinders 14a to 14c has been described. However, the present invention is not necessarily limited to this, and the number of plate cylinders can be set as appropriate according to the printing contents and the like. . Usually, the back printing portion 5 is printed by 1 to 8 plate cylinders. Ink containers 15a to 15c contain back printing ink (known gravure ink) having a predetermined color tone. The ink contains a resin, a solvent, and a colorant (pigment). As the resin, polyurethane, acrylic, chlorinated rubber or the like can be used, and as the solvent, an organic solvent such as toluene, xylene, ketones or ethyl acetate can be used. It is also possible to use water-based ink.

版胴１４ｄは第２表刷部４（０．２〜１ｍｍ間隔で厚さ約２０μｍの突条状）を印刷するための部材であり、インキ容器１５ｄには所定の色調の表刷用のインキが収容されている。インキ容器１５ｄに収容されるインキはポリアミド樹脂系、硝化綿樹脂系が好適に用いられる。光沢および耐摩耗性に優れるからである。 The plate cylinder 14d is a member for printing the second front printing portion 4 (a protrusion having a thickness of about 20 μm at intervals of 0.2 to 1 mm), and the ink container 15d has a predetermined color tone for printing. Is housed. As the ink stored in the ink container 15d, a polyamide resin system or a nitrified cotton resin system is preferably used. It is because it is excellent in gloss and abrasion resistance.

版胴１４ｅは第１表刷部３（表面に微細な凹凸を有する厚さ約５μｍのマット状（梨地状））を印刷するための部材であり、版深度は、第２表刷部４を形成する版胴１４ｄの版深度より浅く設定されている。版胴１４ｄインキ容器１５ｅには所定の色調の表刷用のインキ（塩化ビニル樹脂系、ポリウレタン樹脂系等）が収容されている。 The plate cylinder 14e is a member for printing the first front printing portion 3 (a mat shape (satin texture) having a thickness of about 5 μm having fine irregularities on the surface), and the plate depth is the same as that of the second front printing portion 4. It is set shallower than the plate depth of the plate cylinder 14d to be formed. The plate cylinder 14d ink container 15e contains a surface printing ink (vinyl chloride resin, polyurethane resin, etc.) having a predetermined color tone.

なお、第２表刷部４を形成するためのインキに含まれる顔料（着色剤）の平均粒径は約２０μｍに設定され、第１表刷部３や裏刷部５を形成するためのインキに含まれる顔料の平均粒径は約１μｍに設定されている。 The average particle diameter of the pigment (colorant) contained in the ink for forming the second front printing portion 4 is set to about 20 μm, and the ink for forming the first front printing portion 3 and the back printing portion 5 is used. The average particle size of the pigment contained in is set to about 1 μm.

以上のように構成される印刷装置１０による包装用フィルム１の製造方法について説明する。まず、供給ローラ１１により供給された基材フィルム２は、版胴１４ａ〜１４ｃにより基材フィルム２の裏面にインキが塗布され、乾燥機１８ａ〜１８ｃにより乾燥されて裏刷部５が形成される。裏刷部５が形成された基材フィルム２は反転装置１９により裏表が反転され、版胴１４ｄにより基材フィルム２の表面にインキが塗布され、乾燥機１８ｄにより乾燥されて第２表刷部４が形成される。次に、版胴１４ｅにより第２表刷部４と異なる基材フィルム２の表面の領域にインキが塗布され、乾燥機１８ｅにより乾燥されて、第２表刷部４より膜厚の小さい第１表刷部３が形成される。次いで、ラミネート装置（図示せず）により基材フィルム２の裏面にシーラント層６が形成され、得られた包装用フィルム１が巻取ローラ１７により巻回状に保持される。 The manufacturing method of the packaging film 1 by the printing apparatus 10 comprised as mentioned above is demonstrated. First, the base film 2 supplied by the supply roller 11 is coated with ink on the back surface of the base film 2 by the plate cylinders 14a to 14c, and dried by the dryers 18a to 18c to form the back printing portion 5. . The base film 2 on which the back printing portion 5 is formed is reversed by the reversing device 19, the ink is applied to the surface of the base film 2 by the plate cylinder 14 d, and dried by the dryer 18 d, and then the second front printing portion. 4 is formed. Next, ink is applied to the surface region of the base film 2 different from the second surface printing portion 4 by the plate cylinder 14 e, dried by the dryer 18 e, and the first film thickness smaller than that of the second surface printing portion 4. A surface printing portion 3 is formed. Next, a sealant layer 6 is formed on the back surface of the base film 2 by a laminating apparatus (not shown), and the resulting packaging film 1 is held in a wound shape by a winding roller 17.

この包装用フィルム１の製造方法によれば、同一の基材フィルム２に対して膜厚の大きな第２表刷部４を印刷し乾燥機１８ｄを通過させた後、第２表刷部４より膜厚の小さな第１表刷部３を印刷し乾燥機１８ｅを通過させる。第１表刷部３が乾燥機１８ｅを通過するときは第２表刷部４も乾燥機１８ｅを通過するので、第１表刷部３を乾燥するときには第２表刷部４を一緒に乾燥させることができる。第１表刷部３より膜厚の大きな第２表刷部４の乾燥時間を第１表刷部３の乾燥時間より長くすることができるので、膜厚の大きな第２表刷部４を形成するインキの乾燥不良（溶剤の残留やブロッキング）を防止できる。 According to the method for manufacturing the packaging film 1, the second surface printing portion 4 having a large film thickness is printed on the same base film 2 and passed through the dryer 18 d, and then the second surface printing portion 4. The first front printing section 3 having a small film thickness is printed and passed through the dryer 18e. When the first front printing unit 3 passes through the dryer 18e, the second front printing unit 4 also passes through the dryer 18e. Therefore, when the first front printing unit 3 is dried, the second front printing unit 4 is dried together. Can be made. Since the drying time of the second front printing section 4 having a larger film thickness than the first front printing section 3 can be made longer than the drying time of the first front printing section 3, the second front printing section 4 having a larger film thickness is formed. Insufficient drying of ink (residual solvent or blocking) can be prevented.

また、第２表刷部４を形成するためのインキに含まれる顔料（着色剤）の平均粒径（約２０μｍ）は、第１表刷部３や裏刷部５を形成するためのインキに含まれる顔料の平均粒径（約１μｍ）より大きな値に設定されている。これにより第２表刷部４を所定の大きな膜厚（約２０μｍ）にすることができると共に、第２表刷部４に溶剤の残留やブロッキングを抑制できる。 The average particle diameter (about 20 μm) of the pigment (colorant) contained in the ink for forming the second front printing portion 4 is the same as that for the ink for forming the first front printing portion 3 and the back printing portion 5. It is set to a value larger than the average particle size (about 1 μm) of the contained pigment. As a result, the second front printing portion 4 can be made to have a predetermined large film thickness (about 20 μm), and residual solvent and blocking of the second front printing portion 4 can be suppressed.

また、第２表刷部４は、第１表刷部３とは異なる領域であって第１表刷部３とロール軸方向（図２（ａ）左右方向）に並設される所定の領域に形成されており、第１表刷部３は所定の膜厚（約５μｍ）に形成されている。第１表刷部３が形成されていない場合、第２表刷部４と基材フィルム２との間の高低差は約２０μｍとなる。この高低差は、基材フィルム２を巻取ローラ１７に巻き取るときに、巻取りロールにシワ等が生じる原因となる。 Further, the second front printing section 4 is a predetermined area that is different from the first front printing section 3 and is juxtaposed with the first front printing section 3 in the roll axis direction (left and right direction in FIG. 2A). The first front printing portion 3 is formed to have a predetermined film thickness (about 5 μm). When the first front printing portion 3 is not formed, the height difference between the second front printing portion 4 and the base film 2 is about 20 μm. This height difference causes wrinkles and the like to occur on the winding roll when the base film 2 is wound around the winding roller 17.

これに対し、第１表刷部３により第２表刷部４と基材フィルム２との間の高低差を約１５μｍに緩和できる。第１表刷部３及び第２表刷部４はロール軸方向に並設されているので、包装用フィルム１を巻取ローラ１７に巻き取るときに、巻取りロールにシワ等の不具合が生じることを防止できる。これにより、既存の印刷装置１０を用いて、包装袋７の識別性を向上できる包装用フィルム１を製造できる。また、この包装用フィルム１によれば、既存の製袋装置（図示せず）を用いて包装袋７を製造することが可能である。 On the other hand, the height difference between the 2nd surface printing part 4 and the base film 2 can be eased by the 1st surface printing part 3 to about 15 micrometers. Since the first front printing unit 3 and the second front printing unit 4 are arranged side by side in the roll axis direction, when the packaging film 1 is wound around the winding roller 17, defects such as wrinkles occur in the winding roll. Can be prevented. Thereby, the film 1 for packaging which can improve the distinguishability of the packaging bag 7 using the existing printing apparatus 10 can be manufactured. Moreover, according to this packaging film 1, it is possible to manufacture the packaging bag 7 using the existing bag making apparatus (not shown).

また、第１表刷部３は、基材フィルム２の表面とは異なる表面粗さを有する粗面状（梨地状）に形成されているので、包装用フィルム１を巻取ローラ１７等のロール軸に巻き取るときに、基材フィルム２の表面に形成された第１表刷部３と基材フィルム２の裏面とを滑り難くできる。包装用フィルム１を巻き取るときの基材フィルム２の層間の摩擦力が低下すると、ロール軸の軸方向（図４紙面垂直方向）に基材フィルム２が滑り易くなりスリップが生じやすくなるところ、粗面状に形成された第１表刷部３により基材フィルム２間の摩擦力が低下することを抑制できる。これにより包装用フィルム１を巻取ローラ１７等のロール軸に巻き取るときに、包装用フィルム１が蛇行することを防止できると共に、巻取りロールにスリップを生じ難くできる。 Moreover, since the 1st front printing part 3 is formed in the rough surface shape (satin finish) which has the surface roughness different from the surface of the base film 2, the rolls, such as the winding roller 17, are wound on the packaging film 1 When winding on the shaft, it is possible to make it difficult for the first surface printing portion 3 formed on the surface of the base film 2 and the back surface of the base film 2 to slip. When the frictional force between the layers of the base film 2 when winding the packaging film 1 is reduced, the base film 2 is easily slipped in the axial direction of the roll axis (the vertical direction in FIG. 4), and slipping is likely to occur. It can suppress that the frictional force between the base film 2 falls by the 1st surface printing part 3 formed in rough surface shape. As a result, when the packaging film 1 is wound around the roll shaft such as the winding roller 17, the packaging film 1 can be prevented from meandering, and the winding roll can be prevented from slipping.

次に図５を参照して第２実施の形態について説明する。第１実施の形態では、第２表刷部４を版胴１４ｄによるインキの一度の転移によって形成する場合について説明した。これに対し第２実施の形態では、第２印刷部２４を複数回のインキの転移によって形成する場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。 Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where the second front printing portion 4 is formed by a single transfer of ink by the plate cylinder 14d has been described. In contrast, in the second embodiment, a case will be described in which the second printing unit 24 is formed by a plurality of ink transfers. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

図５（ａ）は第２実施の形態における包装用フィルム２１の製造途中の形態を示すロール軸方向（図１（ｂ）左右方向）における模式断面図であり、図５（ｂ）はロール軸方向における包装用フィルム２１の模式断面図であり、図５（ｃ）は図４（ｂ）のＩＶｃ−ＩＶｃ線における包装用フィルム２１の模式断面図である。図５（ｂ）及び図５（ｃ）では、基材フィルム２の裏面に形成されるシーラント層６の図示を省略している。 Fig.5 (a) is a schematic cross section in the roll-axis direction (FIG.1 (b) left-right direction) which shows the form in the middle of manufacture of the packaging film 21 in 2nd Embodiment, FIG.5 (b) is a roll axis | shaft. FIG. 5C is a schematic cross-sectional view of the packaging film 21 taken along the line IVc-IVc in FIG. 4B. In FIG. 5B and FIG. 5C, illustration of the sealant layer 6 formed on the back surface of the base film 2 is omitted.

包装用フィルム２１は、印刷装置１０（図４参照）において、裏刷部５を乾燥する乾燥機１８ｃと第１表刷部３を形成する圧胴１３ｅとの間に、圧胴１３ｄ、版胴１４ｄ、インキ容器１５ｄ及び乾燥機１８ｄを複数組設けることにより、印刷乾燥が複数回繰り返され第２表刷部２４が形成され製造される。この場合に用いられる版胴は、１回の印刷で第２表刷部２４を形成する場合の版胴の版深度と比較して、版深度を小さい値に設定したものが用いられる。 The packaging film 21 includes, in the printing apparatus 10 (see FIG. 4), an impression cylinder 13d and a plate cylinder between a dryer 18c that dries the back printing unit 5 and an impression cylinder 13e that forms the first front printing unit 3. By providing a plurality of sets 14d, ink containers 15d, and dryers 18d, printing and drying are repeated a plurality of times to form and manufacture the second front printing portion 24. The plate cylinder used in this case is one in which the plate depth is set to a small value compared to the plate depth of the plate cylinder when the second front printing portion 24 is formed by one printing.

図５（ａ）に示すように、裏刷部５が形成された基材フィルム２の表面に、グラビア印刷法により第１印刷部２４ａが突条状にパターン印刷され乾燥される。第１印刷部２４ａの膜厚は、目標とする第２表刷部２４の膜厚より薄く形成される。これにより、インキの一度の転移によって膜厚の大きな第２表刷部２４を形成する場合と比較して、確実に第１印刷部２４ａの残留溶剤を減らすことができると共にブロッキングを防止できる。 As shown to Fig.5 (a), the 1st printing part 24a is pattern-printed on the surface of the base film 2 in which the back printing part 5 was formed by the gravure printing method, and is dried. The film thickness of the first printing unit 24 a is formed to be thinner than the target film thickness of the second front printing unit 24. Thereby, compared with the case where the 2nd printing part 24 with a big film thickness is formed by one transfer of ink, the residual solvent of the 1st printing part 24a can be reduced reliably and blocking can be prevented.

次に図５（ｂ）に示すように、第１印刷部２４ａの印刷パターンの上に重ねて、グラビア印刷法により第２印刷部２４ｂがパターン印刷され乾燥される。本実施の形態では、図５（ｂ）及び図５（ｃ）に示すように、突条状の第１印刷部２４ａの上に点状（突起状）にパターン印刷されている。なお、第２印刷部２４ｂの点状の印刷パターンの寸法は、版胴に形成された製版凹凸目より大きい寸法（ドット）に設定されている。 Next, as shown in FIG. 5 (b), the second printing unit 24b is printed by pattern printing by the gravure printing method, overlaid on the printing pattern of the first printing unit 24a, and dried. In the present embodiment, as shown in FIG. 5B and FIG. 5C, a pattern is printed in the form of dots (projections) on the first printing portion 24a having a ridge shape. In addition, the dimension of the dot-shaped printing pattern of the 2nd printing part 24b is set to the dimension (dot) larger than the plate-making unevenness | corrugation formed in the plate cylinder.

第２印刷部２４ｂは、第１印刷部２４ａの印刷パターンの面積より小さい面積の突起状の印刷パターンなので、第１印刷部２４ａに残留する溶剤を、突起状の第２印刷部２４ｂの間から揮発させ易くすることができる。これにより第２表刷部２４の残留溶剤を確実に減らすことができる。また、第１印刷部２４ａに重ねて、第２印刷部２４ｂにより突起状の印刷パターンが形成されるので、第２表刷部２４の凹凸感を強調できる。 Since the second printing unit 24b is a protruding printing pattern having an area smaller than that of the printing pattern of the first printing unit 24a, the solvent remaining in the first printing unit 24a is removed from between the protruding second printing units 24b. It can be easily volatilized. Thereby, the residual solvent of the 2nd front printing part 24 can be reduced reliably. In addition, since the protruding print pattern is formed by the second printing unit 24b so as to overlap the first printing unit 24a, the unevenness of the second front printing unit 24 can be emphasized.

また、第２印刷部２４ｂが乾燥されるときに第１印刷部２４ａも併せて乾燥されるので、第１印刷部２４ａを第２印刷部２４ｂより長い時間乾燥させることができる。これにより第１印刷部２４ａの残留溶剤を減らすことができる。 Further, since the first printing unit 24a is also dried when the second printing unit 24b is dried, the first printing unit 24a can be dried for a longer time than the second printing unit 24b. Thereby, the residual solvent of the 1st printing part 24a can be reduced.

以上、実施の形態に基づき本発明を説明したが、本発明は上記実施の形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の改良変形が可能であることは容易に推察できるものである。例えば、上記実施の形態で挙げた数値（例えば各印刷パターンの膜厚や顔料の平均粒径等）は一例であり、他の数値を採用することは当然可能である。 As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the numerical values (for example, the film thickness of each print pattern, the average particle diameter of the pigment, etc.) given in the above embodiment are examples, and other numerical values can naturally be adopted.

上記第１実施の形態では、第１表刷部３及び第２表刷部４が平面視して全体として矩形状に形成される場合や、包装袋７が平面視して矩形状に形成される場合について説明したが、必ずしもこれに限られるものではなく、包装袋７、第１表刷部３及び第２表刷部４を方形状、円形状、長円状等の任意の形状に適宜設定することは当然可能である。 In the first embodiment, the first front printing unit 3 and the second front printing unit 4 are formed in a rectangular shape as a whole when viewed in plan, or the packaging bag 7 is formed in a rectangular shape in plan view. However, the present invention is not necessarily limited to this, and the packaging bag 7, the first front printing unit 3, and the second front printing unit 4 are appropriately formed into an arbitrary shape such as a square shape, a circular shape, or an oval shape. Of course, it is possible to set.

上記第２実施の形態では、第１印刷部２４ａを突条状に形成し、第２印刷部２４ｂを点状に形成する場合について説明したが、必ずしもこれに限られるものではなく、第１印刷部２４ａを平面状にパターン印刷し、その第１印刷部２４ａの上面に突起状（突条状や点状等）の第２印刷部２４ｂを重ねてパターン印刷することは当然可能である。この場合も、第１印刷部２４ａの印刷パターンの面積より第２印刷部２４ｂの印刷パターンの面積を小さい値に設定することにより、第１印刷部２４ａの乾燥不良を抑制できる。なお、第１印刷部２４ａ及び第２印刷部２４ｂの印刷パターンの形状や膜厚は、包装袋７に収容される内容物に応じて適宜設定することが可能である。 In the second embodiment, the case where the first printing unit 24a is formed in a ridge shape and the second printing unit 24b is formed in a dot shape has been described. However, the present invention is not necessarily limited to this, and the first printing Of course, it is possible to pattern-print the portion 24a in a flat pattern, and to print the pattern by superimposing a second printing portion 24b having a protruding shape (such as a ridge shape or a dot shape) on the upper surface of the first printing portion 24a. Also in this case, by setting the area of the printing pattern of the second printing unit 24b to be smaller than the area of the printing pattern of the first printing unit 24a, it is possible to suppress the drying failure of the first printing unit 24a. In addition, the shape and film thickness of the printing pattern of the 1st printing part 24a and the 2nd printing part 24b can be suitably set according to the content accommodated in the packaging bag 7. FIG.

また、上記第２実施の形態では、第１印刷部２４ａに第２印刷部２４ｂを重ねること（２回の重ね印刷）により第２表刷部２４を形成する場合について説明したが、必ずしもこれに限られるものではなく、３回以上の重ね印刷により第２表刷部２４を形成することは当然可能である。 In the second embodiment, the case where the second front printing unit 24 is formed by superimposing the second printing unit 24b on the first printing unit 24a (twice overprinting) has been described. Of course, the second front printing portion 24 can be formed by overprinting three or more times.

上記各実施の形態では、包装用フィルム１，２１の合掌貼りにより包装袋７を製造する場合について説明したが、必ずしもこれに限られるものではなく、シーラント層６がヒートシールされて製袋されるのであれば、三方製袋等の他の方法により包装袋を製造するものに包装用フィルム１，２１を適用することは当然可能である。なお、三方製袋による場合には、それに応じて第１表刷部３、第２表刷部４，２４及び裏刷部５の形状や文字の配置、図柄等は適宜設定される。 In each of the embodiments described above, the case where the packaging bag 7 is manufactured by gluing the packaging films 1 and 21 is described. However, the present invention is not necessarily limited to this, and the sealant layer 6 is heat-sealed to form a bag. In that case, it is naturally possible to apply the packaging films 1 and 21 to those for producing packaging bags by other methods such as three-way bag making. In the case of three-sided bag making, the shape, character arrangement, design, etc. of the first front printing unit 3, the second front printing unit 4, 24, and the back printing unit 5 are appropriately set accordingly.

１，２１包装用フィルム
２基材フィルム
３第１表刷部
４，２４第２表刷部
５裏刷部
６シーラント層
８封止部
８ａ上貼り部
８ｂ下貼り部
８ｃ背貼り部 DESCRIPTION OF SYMBOLS 1,21 Packaging film 2 Base film 3 1st front printing part 4,24 2nd front printing part 5 Back printing part 6 Sealant layer 8 Sealing part 8a Upper pasting part 8b Lower pasting part 8c Back pasting part

Claims

In a packaging film that is provided with a sealant layer that is laminated on the back surface of a synthetic resin base film, and that is held in a wound shape on a roll shaft,
A back-printed portion printed on the back surface of the base film and covered with the sealant layer;
A first front printing portion that is printed and formed at a predetermined film thickness in a predetermined region on the surface opposite to the back surface of the base film on which the back printing portion is formed;
The first front printing portion is printed in a concavo-convex pattern having a thickness larger than that of the first front printing portion in a predetermined region that is different from the first front printing portion and is arranged in parallel with the first front printing portion in the roll axis direction. A packaging film comprising: the first front printing portion and a second front printing portion having a surface roughness that is different from the surface.

The packaging film according to claim 1, wherein the first front printing portion is formed in a rough surface shape having a surface roughness different from the surface of the base film.

In the sealant layer, a sealing part is formed by heat sealing the base film,
The said 1st front printing part and the said 2nd front printing part are at least formed in the area | region except the predetermined part of the said base film in which the said sealing part is formed, The Claim 1 or 2 characterized by the above-mentioned. The packaging film as described.

In the method for producing a packaging film in which letters and designs are printed by gravure printing using a plurality of plates on the same base film made of synthetic resin and held in a roll shape on a roll shaft,
A back printing step of forming a printing pattern on the back surface of the base film;
A second front printing for forming a second front printing part by printing an uneven printing pattern with a predetermined film thickness on a predetermined region of the surface of the base film on which the printing pattern is formed by the back printing process and drying it. Part forming step;
From the second front printing section to a predetermined area that is different from the second front printing section formed by the second front printing section forming step and is arranged in parallel with the second front printing section in the roll axis direction. A first front surface portion forming step of forming a first front surface portion by printing a printed pattern with a small film thickness and drying;
A laminating step of laminating and forming a sealant layer on the back surface of the base film on which the first front printing portion is formed by the first front printing portion forming step,
The method for producing a packaging film, wherein the second front printing portion formed by the second front printing portion forming step has a surface roughness that is different from the first front printing portion and the surface. .

The second surface printing portion forming step includes a first printing step of pattern-printing and drying ink on a predetermined region of the surface of the base film,
A second printing step in which the ink is patterned and dried on the printing pattern formed by the first printing step; and
5. The method for manufacturing a packaging film according to claim 4, wherein the second front printing portion is formed by superposition of a plurality of pattern printings.

6. The method for producing a packaging film according to claim 5, wherein the second printing step forms a protruding printing pattern having an area smaller than the area of the printing pattern formed by the first printing step.