JP3588057B2 - Resin molding and method for producing the same - Google Patents

Resin molding and method for producing the same Download PDF

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Publication number
JP3588057B2
JP3588057B2 JP2001068634A JP2001068634A JP3588057B2 JP 3588057 B2 JP3588057 B2 JP 3588057B2 JP 2001068634 A JP2001068634 A JP 2001068634A JP 2001068634 A JP2001068634 A JP 2001068634A JP 3588057 B2 JP3588057 B2 JP 3588057B2
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ultraviolet
thermosetting resin
layer
resin layer
film
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JP2002264289A (en
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直人 石井
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、高度な意匠性を有する樹脂成形体およびその製造方法に係り、特に、車両船舶航空機用内外装パネル、建材、家電製品、家具、壁紙、仏壇、仏具、表札、容器、衣料、靴、バック、テレフォンカード、クレジットカード、ICカード等に好適な樹脂成形体およびその製造方法に関するものである。
【0002】
【従来の技術】
意匠性を付与した樹脂成形体としては、プラスチック基材に図柄を付与し、その表面に塗料樹脂液を流し込み、硬化させた樹脂成形体が知られている。また、樹脂成形体により高度な意匠性を付与するために、表面に凹凸を形成すべく、エンボス賦形フィルムを用いて樹脂表面にエンボス加工した樹脂成形体、または、その後にワイピング印刷をさらに施した樹脂成形体等が知られている。さらに、特開平5−57864号公報では、凹凸感を強調した意匠的に優れた樹脂成形品が開示されている。
【0003】
【発明が解決しようとする課題】
しかしながら、上記のような従来技術では立体感、本物感が乏しく、特開平5−57864号公報に開示の樹脂成形体は立体感が得られるものの、製造工程が煩雑であり、製造コストが高いという問題があった。また、上記従来の樹脂成形体は表面に凹凸を有する構成であるため、耐久性、防汚性といった点で問題を有するものであり、また、特異的な手触り感があり、この樹脂成形体を利用できる用途が限定されてしまう。
【0004】
したがって、本発明はかかる問題点に鑑み、表面が平坦で凹凸が無いにもかかわらず立体感が得られ、高度な意匠性を表現できる樹脂成形体およびその製造方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明の樹脂成形体は、射出成形により得られた樹脂基材と、この上で一体化された印刷フィルムとからなる、射出成形により得られた樹脂成形体の構造において、この印刷フィルムは、熱可塑性フィルムと、熱可塑性フィルムの裏面に印刷された印刷絵付け層と、熱可塑性フィルムの表面の一部に印刷された紫外線または熱硬化性樹脂層とからなり、この紫外線または熱硬化性樹脂層は、熱可塑性フィルム中に埋没しており、かつ、熱可塑性フィルム表面と紫外線または熱硬化性樹脂層表面とが略平坦であり、印刷絵付け層は、紫外線または熱硬化性樹脂層が設けられた領域に対応する領域とその他の領域との間で表面からの距離に差が生じていることを特徴としている。
【0006】
本発明の樹脂成形体によれば、熱可塑性フィルム中に紫外線または熱硬化性樹脂層が埋没し、熱可塑性フィルム表面と紫外線または熱硬化性樹脂層表面とが略平坦となっているため、手触り感に優れた表面を形成することができるとともに、印刷絵付け層の紫外線または熱硬化性樹脂層が設けられた領域に対応する領域とその他の領域との間で表面からの距離に差が生じている、つまり、この印刷絵付け層には部分的に段差が形成されているため、立体感、奥行き感のある意匠性の高い外観を得ることができる。また、紫外線または熱硬化性樹脂層が熱可塑性フィルムに埋没しているため、樹脂層の剥がれを防止することができる。
【0007】
また、本発明の樹脂成形体の製造方法は、熱可塑性フィルムの裏面に絵付け印刷して印刷絵付け層を形成する工程と、この熱可塑性フィルムの表面の一部に紫外線または熱硬化性樹脂を印刷、硬化して紫外線または熱硬化性樹脂層を形成する工程と、この紫外線または熱硬化性樹脂層を熱可塑性フィルム中に埋没させるとともに、印刷絵付け層の紫外線または熱硬化性樹脂層が設けられた領域に対応する領域とその他の領域との間で表面からの距離に差が生じるように、上記積層体の印刷絵付け層側から樹脂基材を射出成形して接着一体化する工程とを備えたことを特徴としている。
【0008】
本発明の製造方法によれば、上記の樹脂成形体を好適に製造することができ、特に、熱可塑性フィルムの裏面に印刷絵付け層が設けられ、熱可塑性フィルムの表面の一部に紫外線または熱硬化性樹脂層が設けられた構成の印刷フィルムに、印刷絵付け層側から樹脂基材を成形することによって、紫外線または熱硬化性樹脂層が設けられた領域の印刷フィルムの厚さと設けられていない領域の印刷フィルムの厚さが異なることを利用して、部分的に表面からの距離の異なる印刷絵付け層を形成することができ、同時に、成形時の熱により柔軟性を有した熱可塑性フィルム中に紫外線または熱硬化性樹脂層を埋没することができる。
【0009】
また、紫外線または熱硬化性樹脂層は、通常、加熱成形時において延びが少ないため印刷インキが割れ易いが、本発明によれば、この層が存在しない領域が選択的に延伸されることにより、印刷インキの割れを防ぎ、平板状のみならず自由な形状、例えばU字型、コの字型等の成形体を製造することができる。
【0010】
【発明の実施の形態】
以下、本発明の樹脂成形体およびその製造方法について工程順に説明する。
「印刷絵付け層の形成工程」
熱可塑性フィルムとしては、透明であり、印刷が可能なフィルムであれば特に限定はないが、特に、アクリル、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリフッ化ビニリデン(PVDF)、ポリスチレン(PS)、ポリカーボネート(PC)、ポリプロピレン(PP)、ポリエチレン(PE)等が好ましい。
【0011】
印刷絵付け層としては、特に限定は無く、絵柄、模様、文字等を印刷することができる。また、印刷絵付け層の絵柄等のベース色としては、アルミ顔料等を用いた高輝度な色調を有するものが好ましく、これにより、優れたコントラストを得ることができる。
【0012】
印刷絵付け層の形成方法としては、グラビア印刷、オフセット印刷、スクリーン印刷等の公知技術を用いることができ、これによって、図1(a)のように、上記の熱可塑性フィルム1の裏面に印刷絵付け層2を印刷して形成する。
【0013】
「紫外線または熱硬化性樹脂層の形成工程」
紫外線または熱硬化性樹脂としては、一般公知の樹脂、例えば、ホルムアルデヒド樹脂、アミノ樹脂、フェノール樹脂、エポキシ樹脂、ポリウレタン樹脂、尿素樹脂、メラミン樹脂、アルキド樹脂、不飽和ポリエステル等を用いることができる。これらの紫外線または熱硬化性樹脂3は、スクリーン印刷、グラビア印刷等によって、図1(b)に示すように、熱可塑性フィルム1の表面上に所望のパターンを印刷することができ、その後、紫外線または熱硬化性樹脂層3を適宜紫外線または熱により硬化させて印刷フィルム10を作製する。
【0014】
本発明の樹脂成形体においては、意匠性や美観を向上させるために、この紫外線または熱硬化性樹脂層表面をつや消し状態とすることが好ましい。このつや消し状態の形成方法としては、紫外線硬化性樹脂を用いる場合には、例えば、特開平9−53024号公報に開示の方法を用いて、紫外線硬化性樹脂層の表面に微細な皺を形成し、つや消し状態を形成することができる。このつや消し方法によれば、金型に依存すること無く、任意の領域をつや消し状態とすることができるので好ましい。
【0015】
また、熱硬化性樹脂を用いた場合には、熱硬化性樹脂を印刷後、加熱しながら金属ロールによるエンボス加工を施すことによって、熱硬化性樹脂層の表面に微細なエンボスパターンを形成し、つや消し状態を形成することができる。さらに、熱硬化性樹脂を用いる場合には、予め、金属ロールに彫り込まれたエンボスパターンを転写した熱硬化性樹脂層を形成し、これを熱可塑性フィルム上に接着してもよい。
【0016】
さらに、本発明における紫外線または熱硬化性樹脂層は、熱可塑性フィルム中に埋没する構成であるため、この層がいずれの形状であっても剥がれにくいものであるが、より耐久性を向上させるためには、図1(b)〜(d)に示すように、紫外線または熱硬化性樹脂層の熱可塑性フィルムとの接触面の面積が印刷表面の面積よりも大きい形状とすることが好適である。紫外線または熱硬化性樹脂層がこのような形状であっても、本発明の製造方法によれば、後述の樹脂基材の形成工程における熱により熱可塑性フィルムが柔軟性を有し、この熱可塑性フィルム中に紫外線または熱硬化性樹脂層を完全に埋没することができる。
【0017】
「樹脂基材を成形し、印刷フィルムを接着一体化する工程」
樹脂基材としては、アクリロニトリル−ブタジエン−スチレン共重合体(ABS)、ポリカーボネート(PC)、ポリプロピレン(PP)、ポリフェニルエーテル(PPE)、ポリスチレン(PS)、ポリ塩化ビニル(PVC)を単独または複数組み合わせて用いることができる。
【0018】
本発明における樹脂基材の成形方法としては、真空成形、圧空成形、射出成形型内同時加飾成形、押し出し成形同時貼り等を用いることができる。これらの中でも本発明においては、特に、射出成形型内同時加飾による樹脂基材成形方法が好適である。
【0019】
また、本発明の接着一体化工程においては、予め、印刷フィルムを加熱し、熱可塑性フィルムを軟化させることにより、本発明の樹脂成形体を好適に製造することができる。この印刷フィルムの加熱時間および加熱温度は、熱可塑性樹脂により異なるが、一般的な熱可塑性樹脂を用いた場合、150〜550℃、1〜60秒の範囲内であることが好ましい。
【0020】
本発明の接着一体化方法としては、まず、図1(c)に示すように、予め加熱された印刷フィルム10上の紫外線または熱硬化性樹脂層3の印刷表面を金型またはロール4に圧着させる。次いで、印刷フィルム10の印刷絵付け層2側から上記の成形方法により樹脂基材5を成形する。この樹脂基材5の成形時の圧力により、印刷フィルム10全体が金型またはロール4に押し付けられ、予めの加熱および成形時の熱によって柔軟性を有した熱可塑性フィルム1中に紫外線または熱硬化性樹脂層3が完全に埋没され、同時に、部分的に表面からの距離が異なる印刷絵付け層2が形成される。
【0021】
このような絵付け層2の形状は、図1(d)に示すように、紫外線または熱硬化性樹脂層3が設けられた領域の印刷フィルム10の厚さよりも設けられていない領域の厚さのほうが薄いため、印刷フィルム10が金型またはロール4に押し付けられた際に、紫外線または熱硬化性樹脂層3が設けられた領域の印刷絵付け層2よりも設けられていない領域の方が金型またはロール4に近づけられ、紫外線または熱硬化性樹脂層3の有無による部分的な段差が印刷絵付け層2に生じるために形成される。これにより、樹脂基材5と、この上に一体化された印刷フィルム10とからなる本発明の樹脂成形体20が製造される。
【0022】
【実施例】
以下、実施例により本発明を具体的に説明する。
<実施例1>
まず、アクリルフィルム(熱可塑性フィルム)の裏面に、アルミニウム顔料を用いたメタリック色の印刷絵付け層をグラビア印刷により形成した。次に、イソホロンジイソシアネート666部とテトラヒドロフルフリルアクリレート440部とポリエチレングリコールジアクリレート300部とを混合し、さらにトリメチロールプロパンとイプシロンカプロラクトンの開環反応物1200部を添加しながら70℃で攪拌反応させ、イソシアネート基が減少したのを確認した後、2−ヒドロキシエチルアクリレート350部を仕込み、70℃で反応させ、イソシアネート基を完全に消滅させてウレタンアクリレートを合成した。次いで、このウレタンアクリレートと2−ヒドロキシ−2−メチル−1−フェニルプロパン−1−オンとを97:3重量部で配合したものを、アクリルフィルムの表面にスクリーン印刷し、紫外線照射により硬化させて表面をつや消し状態とした紫外線硬化性樹脂層を形成し、印刷フィルムを作製した。
【0023】
次に、360〜390℃に10秒程度加熱してアクリルフィルムを軟化させた印刷フィルムを、紫外線硬化性樹脂層の印刷表面が金型に圧着するように真空形成させ、次いで、印刷フィルムの印刷絵付け層側からアクリロニトリル−ブタジエン−スチレン共重合体を射出成形し、本発明の樹脂成形体を製造した。この際のシリンダー温度:240度、射出圧:1800kg/cm、保圧:1400kg/cm(2秒)、1000kg/cm(2秒)であった。
【0024】
図2は、製造した本発明の樹脂成形体である。つや消し状態の紫外線硬化性樹脂層が設けられた領域が奥に見え、紫外線硬化性樹脂が設けられていない領域が手前に見えている。しかしながら、この樹脂成形体は、最表面に位置する紫外線硬化性樹脂層表面と熱可塑性フィルム表面とが略平坦であるため、凹凸の無い手触り感の優れた表面が形成されている。すなわち、本発明の樹脂成形体は、表面が平坦であるにもかかわらず、立体感(奥行き感)といった高度な意匠性を表現している。
【0025】
<比較例1>(原着インジェクション)
樹脂基材用の樹脂をそのままインジェクション成形し、比較例1の樹脂成形体を製造した。
<比較例2>(カラーミックスインジェクション)
塗料を混ぜ合わせた樹脂基材用の樹脂をインジェクション成形し、比較例2の樹脂成形体を製造した。
<比較例3>(インジェクション+塗装)
比較例1の樹脂成形体に塗装を施して、比較例3の樹脂成形体を製造した。
【0026】
<比較例4>(インジェックション+水転写フィルム)
所望の柄模様を印刷した水溶性のフィルムを水の入った容器に浸けてフィルムを溶かし、インクが水面に浮いたところに、予め水中に沈めておいた比較例1の樹脂成形体を持ち上げて成形体表面にインクを付着させ、比較例4の樹脂成形体を製造した。
【0027】
<比較例5>(インジェクション成形・印刷フィルム同時貼り(現行印刷フィルム))
印刷フィルムを予め内側に圧着させた金型を用いてインジェクション成形を行うことによって、インジェクション成形と同時に印刷フィルムを貼り付け、比較例5の樹脂成形体を製造した。
【0028】
上記の実施例1および比較例1〜5の樹脂成形体を用いて下記の評価を行い、その結果を表1に示した。
1.色柄模様
所望の絵柄、模様を樹脂成形体上に容易に表せるかを評価した。
○:印刷フィルムを用いるもの。
△:フィルムを用いずに樹脂成形体に直接色付けを行うもの。
×:全く絵柄等を表せないもの。
【0029】
2.立体感
樹脂成形体上に描かれた色柄模様が、立体的に目に映るか否かを評価した。
○:立体的に見えた。
×:立体的には見えなかった。
【0030】
3.部分つや消し
所望の部分に皺または凹凸を形成し、全ての製造工程を完了した時点で、つや消し状態となっているかを評価した。
○:金型に頼らないでつや消し状態を形成できた。
△:金型に頼らなければつや消し状態を形成できなかった。
×:形成後の色付けのために金型を用いても常につや消し状態を形成できるとは限られなかった。
【0031】
【表1】

Figure 0003588057
【0032】
本発明の実施例1の樹脂成形体では、色柄模様、立体感、部分つや消しの全ての項目において優れた特性を示した。これに対し、従来技術の比較例では少なくともいずれかの項目が劣っていた。詳細に見ていくと、色柄模様に関しては、比較例4および5は実施例1と同様、印刷フィルムを使用するため複雑な柄模様等を工業的に簡易に作り出すことができるが、比較例3は絵柄を描くことは可能であるものの大変手間がかかり、工業的には適さない。また、比較例2は塗料の混ぜ方によりマーブル模様のような模様を作成することができるものの一定の模様を作成することはできず、比較例1に至っては樹脂そのものの色であり、柄の表現は不可能である。
【0033】
次いで、立体感に関しては、色柄模様が立体的に見えるような高度な意匠性を有するものは比較例には無かった。また、部分つや消しに関しては、凹凸を設けた金型を用いることで全ての樹脂成形体において部分つや消しを形成することができるが、金型に依存しない本発明と比べると、工業的には満足できるものではない。
【0034】
【発明の効果】
以上説明したように本発明によれば、熱可塑性フィルム中に紫外線または熱硬化性樹脂層が埋没し、熱可塑性フィルム表面と紫外線または熱硬化性樹脂層表面とが略平坦となっているため、手触り感に優れた表面を形成することができるとともに、印刷絵付け層の紫外線または熱硬化性樹脂層が設けられた領域に対応する領域とその他の領域との間で部分的に段差が形成されているため、立体感、奥行き感のある意匠性の高い外観を得ることができる。
【図面の簡単な説明】
【図1】本発明の樹脂成形体の製造方法の各工程を説明する図である。
【図2】本発明の樹脂成形体の一実施形態である。
【符号の説明】
1…熱可塑性フィルム、2…印刷絵付け層、3…紫外線または熱硬化性樹脂層、4…金型またはロール、5…樹脂基材、10…印刷フィルム、20…樹脂成形体。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resin molded product having a high degree of design and a method for producing the same, and particularly to interior / exterior panels for vehicle / vehicle aircraft, building materials, home appliances, furniture, wallpaper, Buddhist altars, Buddhist utensils, nameplates, containers, clothing, shoes The present invention relates to a resin molded product suitable for a back, a telephone card, a credit card, an IC card, and the like, and a method for producing the same.
[0002]
[Prior art]
As a resin molded article having a design property, a resin molded article obtained by applying a design to a plastic base material, pouring a coating resin liquid on the surface thereof, and curing the resin is known. Also, in order to give the resin molded body a high degree of design, in order to form irregularities on the surface, the resin molded body is embossed on the resin surface using an embossed shaping film, or is further subjected to wiping printing. Known resin molded articles and the like are known. Furthermore, Japanese Patent Application Laid-Open No. 5-57864 discloses a resin molded product excellent in design that emphasizes unevenness.
[0003]
[Problems to be solved by the invention]
However, the conventional technique as described above has a poor three-dimensional effect and real feeling, and the resin molded article disclosed in Japanese Patent Application Laid-Open No. 5-57864 can obtain a three-dimensional effect, but the manufacturing process is complicated and the manufacturing cost is high. There was a problem. In addition, since the above-mentioned conventional resin molded body has a configuration having irregularities on the surface, it has problems in durability, antifouling properties, etc., and also has a specific touch feeling, Available applications are limited.
[0004]
Accordingly, the present invention has been made in view of the above-described problems, and has an object to provide a resin molded body which can provide a three-dimensional effect even when the surface is flat and has no unevenness, and can express a high degree of design, and a method for manufacturing the same. .
[0005]
[Means for Solving the Problems]
The resin molded article of the present invention comprises a resin substrate obtained by injection molding , and a printed film integrated thereon, in the structure of the resin molded article obtained by injection molding , the printed film is A thermoplastic film, a printing painting layer printed on the back surface of the thermoplastic film, and an ultraviolet or thermosetting resin layer printed on a part of the surface of the thermoplastic film; The layer is buried in the thermoplastic film, and the surface of the thermoplastic film and the surface of the ultraviolet or thermosetting resin layer are substantially flat, and the printing and painting layer is provided with the ultraviolet or thermosetting resin layer. It is characterized in that there is a difference in the distance from the surface between the region corresponding to the designated region and other regions.
[0006]
According to the resin molded article of the present invention, the ultraviolet or thermosetting resin layer is buried in the thermoplastic film, and the surface of the thermoplastic film and the surface of the ultraviolet or thermosetting resin layer are substantially flat. A surface with excellent feeling can be formed, and there is a difference in the distance from the surface between the region corresponding to the region where the ultraviolet or thermosetting resin layer of the print painting layer is provided and the other region. That is, since a step is partially formed in the printed painting layer, it is possible to obtain a three-dimensional appearance, a sense of depth, and a high design appearance. Further, since the ultraviolet or thermosetting resin layer is buried in the thermoplastic film, peeling of the resin layer can be prevented.
[0007]
In addition, the method for producing a resin molded article of the present invention includes a step of forming a printed painting layer by painting and printing on the back surface of the thermoplastic film, and forming an ultraviolet or thermosetting resin on a part of the surface of the thermoplastic film. The step of printing and curing to form an ultraviolet or thermosetting resin layer, and burying the ultraviolet or thermosetting resin layer in the thermoplastic film, and the ultraviolet or thermosetting resin layer of the print painting layer as a difference in distance from the surface between the region and the other region corresponding to the provided area occurs, the step of integrally bonded by injection molding the resin substrate from the print painting layer side of the laminate It is characterized by having.
[0008]
According to the production method of the present invention, it is possible to suitably produce the above resin molded body, in particular, a printing painting layer is provided on the back surface of the thermoplastic film, and a part of the surface of the thermoplastic film is irradiated with ultraviolet light or By forming the resin base material from the print painting layer side on the print film having the configuration in which the thermosetting resin layer is provided, the thickness of the print film is provided in the region where the ultraviolet or thermosetting resin layer is provided. Utilizing the difference in the thickness of the printed film in the non-printed area, it is possible to form a printed painting layer having a partially different distance from the surface, and at the same time, to provide a flexible film by the heat during molding. An ultraviolet or thermosetting resin layer can be embedded in the plastic film.
[0009]
In addition, the ultraviolet or thermosetting resin layer is usually easy to break the printing ink because of less elongation at the time of heat molding, but according to the present invention, the region where this layer does not exist is selectively stretched, By preventing cracking of the printing ink, it is possible to manufacture not only a flat plate but also a free shape such as a U-shaped or U-shaped.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the resin molded article of the present invention and the method for producing the same will be described in the order of steps.
"Formation process of printed painting layer"
The thermoplastic film is not particularly limited as long as it is a transparent and printable film. In particular, acrylic, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyvinylidene fluoride (PVDF), polystyrene ( PS), polycarbonate (PC), polypropylene (PP), polyethylene (PE) and the like.
[0011]
The printing painting layer is not particularly limited, and a picture, a pattern, a character, and the like can be printed. Further, as a base color such as a pattern of the printed painting layer, a color having a high luminance color tone using an aluminum pigment or the like is preferable, whereby an excellent contrast can be obtained.
[0012]
Known techniques such as gravure printing, offset printing, and screen printing can be used as a method for forming the printing painting layer, whereby the printing is performed on the back surface of the thermoplastic film 1 as shown in FIG. The painting layer 2 is formed by printing.
[0013]
"Process of forming ultraviolet or thermosetting resin layer"
As the ultraviolet or thermosetting resin, generally known resins, for example, formaldehyde resin, amino resin, phenol resin, epoxy resin, polyurethane resin, urea resin, melamine resin, alkyd resin, unsaturated polyester and the like can be used. These ultraviolet or thermosetting resin 3 can print a desired pattern on the surface of the thermoplastic film 1 by screen printing, gravure printing, or the like, as shown in FIG. Alternatively, the thermosetting resin layer 3 is appropriately cured by ultraviolet light or heat to produce the print film 10.
[0014]
In the resin molded article of the present invention, it is preferable that the surface of the ultraviolet ray or the thermosetting resin layer be in a matte state in order to improve the design and the appearance. As a method for forming this matte state, when an ultraviolet-curable resin is used, for example, fine wrinkles are formed on the surface of the ultraviolet-curable resin layer by using a method disclosed in Japanese Patent Application Laid-Open No. 9-53024. A matte state can be formed. According to this matting method, an arbitrary area can be set to a matte state without depending on a mold, which is preferable.
[0015]
Also, when using a thermosetting resin, after printing the thermosetting resin, by applying an embossing process with a metal roll while heating, to form a fine embossed pattern on the surface of the thermosetting resin layer, A matte state can be formed. Further, when a thermosetting resin is used, a thermosetting resin layer to which an embossed pattern engraved on a metal roll is transferred in advance may be formed, and this may be adhered to a thermoplastic film.
[0016]
Furthermore, since the ultraviolet or thermosetting resin layer in the present invention is configured to be buried in a thermoplastic film, it is difficult for this layer to be peeled off in any shape, but in order to further improve durability. As shown in FIGS. 1B to 1D, it is preferable that the area of the contact surface between the ultraviolet ray or the thermosetting resin layer and the thermoplastic film is larger than the area of the printing surface. . Even if the ultraviolet or thermosetting resin layer has such a shape, according to the production method of the present invention, the thermoplastic film has flexibility due to heat in a resin substrate forming step described below, The ultraviolet or thermosetting resin layer can be completely buried in the film.
[0017]
"Process of forming resin substrate and bonding and integrating printed film"
As the resin base material, acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polypropylene (PP), polyphenyl ether (PPE), polystyrene (PS), polyvinyl chloride (PVC) alone or in combination They can be used in combination.
[0018]
As a method for molding the resin substrate in the present invention, vacuum molding, air pressure molding, simultaneous decorative molding in an injection mold, simultaneous extrusion molding, and the like can be used. Among these, in the present invention, a resin substrate molding method by simultaneous decoration in an injection mold is particularly preferred.
[0019]
Further, in the bonding and integrating step of the present invention, the resin molded article of the present invention can be suitably manufactured by previously heating the print film and softening the thermoplastic film. The heating time and heating temperature of the printed film vary depending on the thermoplastic resin, but when a general thermoplastic resin is used, it is preferable that the heating time and the heating temperature be in the range of 150 to 550 ° C. and 1 to 60 seconds.
[0020]
First, as shown in FIG. 1 (c), the bonding surface of the UV-cured or thermosetting resin layer 3 on the pre-heated print film 10 is pressed against a mold or a roll 4 as shown in FIG. Let it. Next, the resin base material 5 is molded from the printed painting layer 2 side of the printed film 10 by the above-described molding method. Due to the pressure at the time of molding the resin base material 5, the entire printed film 10 is pressed against the mold or the roll 4, and the ultraviolet rays or the thermosetting is applied to the thermoplastic film 1 having flexibility by pre-heating and heat at the time of molding. The conductive resin layer 3 is completely buried, and at the same time, the printed painting layer 2 partially different in distance from the surface is formed.
[0021]
As shown in FIG. 1D, the shape of the painting layer 2 is such that the thickness of the region where the ultraviolet or thermosetting resin layer 3 is provided is smaller than the thickness of the print film 10 where the region is not provided. Is thinner, when the printing film 10 is pressed against the mold or the roll 4, the region where the ultraviolet ray or the thermosetting resin layer 3 is provided is not provided in the region where the printing film 10 is not provided than the region where the printing film 2 is provided. The printing / painting layer 2 is formed because the printing / painting layer 2 is brought close to a mold or a roll 4 and has a partial step due to the presence or absence of the ultraviolet ray or the thermosetting resin layer 3. Thereby, the resin molded body 20 of the present invention including the resin base material 5 and the printed film 10 integrated thereon is manufactured.
[0022]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples.
<Example 1>
First, a metallic coloring print painting layer using an aluminum pigment was formed on the back surface of an acrylic film (thermoplastic film) by gravure printing. Next, 666 parts of isophorone diisocyanate, 440 parts of tetrahydrofurfuryl acrylate, and 300 parts of polyethylene glycol diacrylate are mixed, and a stirring reaction is performed at 70 ° C. while adding 1200 parts of a ring-opening reaction product of trimethylolpropane and epsilon caprolactone. After confirming that the isocyanate group was reduced, 350 parts of 2-hydroxyethyl acrylate was charged and reacted at 70 ° C. to completely eliminate the isocyanate group, thereby synthesizing urethane acrylate. Next, a mixture of this urethane acrylate and 2-hydroxy-2-methyl-1-phenylpropan-1-one in a ratio of 97: 3 parts by weight was screen-printed on the surface of an acrylic film, and cured by ultraviolet irradiation. An ultraviolet-curable resin layer having a matte surface was formed to produce a printed film.
[0023]
Next, a printing film in which the acrylic film is softened by heating to 360 to 390 ° C. for about 10 seconds is vacuum-formed so that the printing surface of the ultraviolet-curable resin layer is pressed against the mold, and then the printing of the printing film is performed. An acrylonitrile-butadiene-styrene copolymer was injection molded from the painting layer side to produce a resin molded product of the present invention. At this time, the cylinder temperature was 240 ° C., the injection pressure was 1800 kg / cm 2 , the holding pressure was 1400 kg / cm 2 (2 seconds), and 1000 kg / cm 2 (2 seconds).
[0024]
FIG. 2 shows a manufactured resin molded article of the present invention. The region where the matte state ultraviolet curable resin layer is provided is visible in the back, and the region where the ultraviolet curable resin is not provided is visible in the front. However, since the surface of the ultraviolet curable resin layer located on the outermost surface and the surface of the thermoplastic film are substantially flat, this resin molded body has a surface with no unevenness and excellent touch feeling. That is, the resin molded article of the present invention expresses a high degree of design such as a three-dimensional appearance (depth) even though the surface is flat.
[0025]
<Comparative Example 1> (Original injection)
The resin for the resin substrate was directly injection-molded to produce a resin molded body of Comparative Example 1.
<Comparative Example 2> (Color mix injection)
A resin for a resin substrate mixed with a paint was injection-molded to produce a resin molded body of Comparative Example 2.
<Comparative Example 3> (Injection + painting)
The resin molded product of Comparative Example 1 was coated to produce a resin molded product of Comparative Example 3.
[0026]
<Comparative Example 4> (Injection + water transfer film)
A water-soluble film on which a desired pattern is printed is immersed in a container filled with water to dissolve the film, and when the ink floats on the water surface, the resin molded body of Comparative Example 1 previously submerged in water is lifted. Ink was adhered to the surface of the molded article to produce a resin molded article of Comparative Example 4.
[0027]
<Comparative Example 5> (Injection molding and printing film simultaneous application (current printing film))
Injection molding was performed using a mold in which the print film was press-bonded to the inside in advance, so that the print film was attached at the same time as the injection molding, and a resin molded body of Comparative Example 5 was manufactured.
[0028]
The following evaluation was performed using the resin molded products of Example 1 and Comparative Examples 1 to 5, and the results are shown in Table 1.
1. Color pattern design It was evaluated whether a desired pattern or pattern could be easily expressed on the resin molded body.
:: Printed film is used.
Δ: Coloring is performed directly on the resin molded body without using a film.
×: No pattern or the like can be expressed at all.
[0029]
2. It was evaluated whether or not the color pattern drawn on the three-dimensional resin molded product appeared three-dimensionally.
:: Three-dimensional appearance.
X: It did not look three-dimensional.
[0030]
3. Partial matting Wrinkles or irregularities were formed at desired portions, and when all the manufacturing steps were completed, it was evaluated whether the matting state was reached.
:: A matte state could be formed without relying on a mold.
Δ: A matte state could not be formed without relying on a mold.
×: Matting was not always possible even when a mold was used for coloring after formation.
[0031]
[Table 1]
Figure 0003588057
[0032]
The resin molded product of Example 1 of the present invention exhibited excellent characteristics in all items of the color pattern, the three-dimensional appearance, and the partial matting. On the other hand, at least one of the items was inferior in the comparative example of the related art. Looking at the details, with respect to the color and pattern, in Comparative Examples 4 and 5, as in Example 1, a complicated pattern and the like can be industrially easily created because a printed film is used. No. 3, although it is possible to draw a picture, it takes a lot of time and is not industrially suitable. In Comparative Example 2, although a marble pattern could be created by mixing the paint, a fixed pattern could not be created. In Comparative Example 1, the color of the resin itself was used. Expression is impossible.
[0033]
Next, regarding the three-dimensional effect, none of the comparative examples had a high degree of design such that the color pattern appeared three-dimensionally. Further, with regard to partial matting, partial matting can be formed in all resin molded articles by using a mold provided with irregularities, but is industrially satisfactory as compared with the present invention which does not depend on the mold. Not something.
[0034]
【The invention's effect】
According to the present invention as described above, the ultraviolet or thermosetting resin layer is embedded in the thermoplastic film, and the thermoplastic film surface and the ultraviolet or thermosetting resin layer surface are substantially flat, A surface having an excellent touch feeling can be formed, and a step is partially formed between a region corresponding to the region where the ultraviolet or thermosetting resin layer of the print painting layer is provided and another region. As a result, it is possible to obtain an appearance with a three-dimensional appearance and a sense of depth and high design.
[Brief description of the drawings]
FIG. 1 is a view for explaining each step of a method for producing a resin molded product of the present invention.
FIG. 2 is an embodiment of a resin molded body of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Thermoplastic film, 2 ... Printing painting layer, 3 ... Ultraviolet or thermosetting resin layer, 4 ... Die or roll, 5 ... Resin base material, 10 ... Printing film, 20 ... Resin molding.

Claims (6)

射出成形により得られた樹脂基材と、この上に一体化された印刷フィルムとからなる、射出成形により得られた樹脂成形体において、
前記印刷フィルムは、熱可塑性フィルムと、前記熱可塑性フィルムの裏面に印刷された印刷絵付け層と、前記熱可塑性フィルムの表面の一部に印刷された紫外線または熱硬化性樹脂層とからなり、
前記紫外線または熱硬化性樹脂層は、前記熱可塑性フィルム中に埋没しており、かつ、前記熱可塑性フィルム表面と前記紫外線または熱硬化性樹脂層表面とが略平坦であり、
前記印刷絵付け層は、前記紫外線または熱硬化性樹脂層が設けられた領域に対応する領域とその他の領域との間で表面からの距離に差が生じていることを特徴とする樹脂成形体。
In the resin molded body obtained by injection molding, comprising a resin base material obtained by injection molding and a printed film integrated thereon,
The printing film is a thermoplastic film, a printing painting layer printed on the back surface of the thermoplastic film, and an ultraviolet or thermosetting resin layer printed on a part of the surface of the thermoplastic film,
The ultraviolet or thermosetting resin layer is embedded in the thermoplastic film, and the thermoplastic film surface and the ultraviolet or thermosetting resin layer surface are substantially flat,
The printed molding layer is characterized in that a difference occurs in a distance from a surface between a region corresponding to a region where the ultraviolet ray or thermosetting resin layer is provided and another region. .
前記熱可塑性フィルムは、透明であることを特徴とする請求項1に記載の樹脂成形体。The resin molded body according to claim 1, wherein the thermoplastic film is transparent. 前記紫外線または熱硬化性樹脂層は、表面がつや消し状態に形成されていることを特徴とする請求項1または2に記載の樹脂成形体。The resin molded product according to claim 1, wherein the ultraviolet or thermosetting resin layer has a matte surface. 熱可塑性フィルムの裏面に絵付け印刷して印刷絵付け層を形成する工程と、
前記熱可塑性フィルムの表面の一部に紫外線または熱硬化性樹脂を印刷、硬化して紫外線または熱硬化性樹脂層を形成する工程と、
前記紫外線または熱硬化性樹脂層を前記熱可塑性フィルム中に埋没させるとともに、前記印刷絵付け層の前記紫外線または熱硬化性樹脂層が設けられた領域に対応する領域とその他の領域との間で表面からの距離に差が生じるように、上記積層体の前記印刷絵付け層側から樹脂基材を射出成形して接着一体化する工程とを備えたことを特徴とする樹脂成形体の製造方法。
A step of painting and printing on the back side of the thermoplastic film to form a printed painting layer,
A step of printing an ultraviolet ray or a thermosetting resin on a part of the surface of the thermoplastic film, and curing to form an ultraviolet ray or a thermosetting resin layer,
While burying the ultraviolet or thermosetting resin layer in the thermoplastic film, between the region corresponding to the region provided with the ultraviolet or thermosetting resin layer of the printed painting layer and other regions Injection molding a resin base material from the printed painting layer side of the laminate so as to cause a difference in distance from the surface, and bonding and integrating the resin base material. .
前記紫外線または熱硬化性樹脂層を形成する工程において、前記紫外線または熱硬化性樹脂層表面をつや消し状態に形成することを特徴とする請求項4に記載する樹脂成形体の製造方法。5. The method according to claim 4, wherein, in the step of forming the ultraviolet or thermosetting resin layer, the surface of the ultraviolet or thermosetting resin layer is formed in a matte state. 6. 前記樹脂基材の射出成形は、射出成形型内同時加飾成形であることを特徴とする請求項4または5に記載の樹脂成形体の製造方法。The method according to claim 4, wherein the injection molding of the resin base is simultaneous decoration molding in an injection mold .
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