JP5519364B2 - WOODEN DECORATIVE SHEET, PROCESS FOR PRODUCING THE SAME, WOODEN RESIN MOLDED MATERIAL AND PROCESS FOR PRODUCING THE SAME - Google Patents

WOODEN DECORATIVE SHEET, PROCESS FOR PRODUCING THE SAME, WOODEN RESIN MOLDED MATERIAL AND PROCESS FOR PRODUCING THE SAME Download PDF

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JP5519364B2
JP5519364B2 JP2010072597A JP2010072597A JP5519364B2 JP 5519364 B2 JP5519364 B2 JP 5519364B2 JP 2010072597 A JP2010072597 A JP 2010072597A JP 2010072597 A JP2010072597 A JP 2010072597A JP 5519364 B2 JP5519364 B2 JP 5519364B2
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千秋 田代
千勝 秋定
勝明 渡部
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Wavelock Advanced Tech Co Ltd
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Description

本発明は、自動車内外装、家具、建築材料、鞄、家電製品、オーディオ、パソコン、携帯電話、カメラ、ビデオカメラ、看板、ディスプレイ、ネームプレート、額縁、パチンコ−パチスロ等アミューズメント製品、各種雑貨等の樹脂製品の表面に木質感を付加する木質調加飾シート、その製造方法、及び、かかる木質調加飾シートを用いて成形された木質調樹脂成形物に関する。   The present invention includes automobile interior and exterior, furniture, building materials, bags, home appliances, audio, personal computers, mobile phones, cameras, video cameras, signboards, displays, nameplates, picture frames, pachinko / pachislot and other amusement products, various miscellaneous goods, etc. The present invention relates to a wood-like decorative sheet for adding a wood texture to the surface of a resin product, a method for producing the same, and a wood-like resin molded product formed using the wood-like decorative sheet.

従来、木質調外観を有する成形物の製造方法として特許第3191657号(特許文献1)に係る技術が知られていた。この技術は、表面に木質化粧材を有するインジェクション成形品を母材として形成した後、この母材の表面にウレタン、エポキシ、アミノアルキド、アクリル及びそれらの変性樹脂からなる着色された少なくとも一層の熱硬化性塗膜層と、着色及び又は透明な熱硬化性塗膜からなるシーラー層とを任意の順序で積層し、シーラー層の表面に接着剤及びプライマーを介して透明な熱可塑性樹脂シートを積層して熱圧プレスする方法である。   Conventionally, the technique which concerns on patent 3191657 (patent document 1) was known as a manufacturing method of the molded object which has a woody appearance. In this technology, after forming an injection molded product having a wooden decorative material on the surface as a base material, the surface of the base material is heated with at least one colored layer made of urethane, epoxy, aminoalkyd, acrylic and their modified resins. Laminating a curable coating layer and a sealer layer made of a colored and / or transparent thermosetting coating in any order, and laminating a transparent thermoplastic resin sheet on the surface of the sealer layer via an adhesive and a primer And hot pressing.

すなわち、この技術では外観の見栄えを向上させるために、木質化粧材に熱硬化性樹脂を積層し、さらにシーラーを積層することで熱履歴時の層間剥離を防止した上で、熱可塑性樹脂層を積層している。   In other words, in this technology, in order to improve the appearance of the appearance, a thermosetting resin is laminated on the wooden decorative material, and further a sealer is laminated to prevent delamination during heat history, and then the thermoplastic resin layer is formed. Laminated.

しかしながら、この従来技術によれば、インジェクション成型後に、樹脂の塗布・積層を繰り返し、さらに、最後に熱プレスするという7つ以上の工程を必要とする上に、立体面を有する成形物の場合、上記積層は熟練した職人による手作業ないし手作業に近い作業となり、量産化には困難があった。   However, according to this prior art, after injection molding, the application and lamination of the resin are repeated, and further, it requires seven or more steps of finally hot pressing, and in the case of a molded product having a three-dimensional surface, The above-mentioned lamination is a manual work by skilled craftsmen or a work close to manual work, and it has been difficult to mass-produce.

特許第3191657号Japanese Patent No. 3191657

本発明は、樹脂製品に木質調の外観を容易に付与することができる木質調加飾シート、を提供することを目的とする。   An object of the present invention is to provide a wood-like decorative sheet that can easily impart a wood-like appearance to a resin product.

本発明の木質調加飾シートは、請求項1に記載の通り、透明樹脂シート、接着剤層、および、木質層がこの順に積層されて構成され前記接着剤層の接着剤がシリル化ウレタン系接着剤であり、かつ、前記接着剤の目付が70g/m2以上150g/m2以下であることを特徴とする木質調加飾シートである。 Woody decorative sheet of the present invention, as described in claim 1, a transparent resin sheet, an adhesive layer, and, wood layers are stacked in this order, the adhesive of the adhesive layer is silylated urethane It is a wood-based decorative sheet, and the basis weight of the adhesive is 70 g / m 2 or more and 150 g / m 2 or less.

また、本発明の木質調加飾シートは、請求項2に記載の通り、請求項1に記載の木質調加飾シートにおいて、上記木質層厚さが0.1mm以上1mm以下であることを特徴とする。   Moreover, the woody decoration sheet | seat of this invention is the woody decoration sheet | seat of Claim 1 as described in Claim 2, The said woody layer thickness is 0.1 mm or more and 1 mm or less, It is characterized by the above-mentioned. And

また、本発明の木質調加飾シートは、請求項3に記載の通り、請求項2に記載の木質調加飾シートにおいて、上記木質層の透明樹脂シート側面に木目調印刷が施されていることを特徴とする請求項1または請求項2に記載の木質調加飾シートである。   Moreover, the wood-like decoration sheet | seat of this invention is the wood-like decoration sheet | seat of Claim 2 as described in Claim 3, The woodgrain printing is given to the transparent resin sheet side surface of the said wood layer. The woody decorative sheet according to claim 1 or 2, characterized in that.

本発明の木質調加飾シートの製造方法は、請求項4に記載の通り、透明樹脂シートに接着剤の目付が70g/m2以上150g/m2以下の接着剤層を介して木質シートを積層して積層板を得る積層工程と、前記積層板を加熱しながら加圧するプレス工程と、をこの順で備えたことを有する木質調加飾シートの製造方法である。 According to the method for producing a woody decorative sheet of the present invention, as described in claim 4, the woody sheet is applied to the transparent resin sheet via an adhesive layer having an adhesive basis weight of 70 g / m 2 or more and 150 g / m 2 or less. It is the manufacturing method of the woody decoration sheet | seat which has the lamination process which laminates | stacks and obtains a laminated board, and the press process pressurized while heating the said laminated board in this order.

本発明の木質調樹脂成形物は、請求項5に記載の通り、請求項1ないし請求項3のいずれか1項に記載の木質調加飾シートがインサートとしてキャビティ内に収納されて射出成形されたことを特徴とする木質調樹脂成形物である。 As described in claim 5, the wood-like resin molded product of the present invention is injection-molded by accommodating the wood-like decorative sheet according to any one of claims 1 to 3 as an insert in a cavity. A wood-like resin molded product characterized by the above.

本発明の木質調樹脂成形物の製造方法は、請求項6に記載の通り、請求項1ないし請求項3のいずれか1項に記載の木質調加飾シートをインサートとして、該木質調加飾シートの木質層側に樹脂を射出成形することを特徴とする木質調樹脂成形物の製造方法。   The method for producing a wood-like resin molded product of the present invention is as described in claim 6, wherein the wood-like decoration sheet according to any one of claims 1 to 3 is used as an insert. A method for producing a wood-like resin molded product, characterized in that a resin is injection-molded on a wood layer side of a sheet.

また、本発明の木質調樹脂成形物の製造方法は、請求項7に記載の通り、請求項6に記載の木質調樹脂成形物の製造方法において、前記射出成形前の前記木質調加飾シートが、曲げ加工されていることを特徴とする。   Moreover, the manufacturing method of the wood tone resin molding of this invention is the manufacturing method of the wood tone resin molding of Claim 6, as described in Claim 7, The said wood tone decoration sheet before the said injection molding in the manufacturing method of Claim 6 Is bent.

また、本発明の木質調樹脂成形物の製造方法は、請求項8に記載の通り、請求項7に記載の木質調樹脂成形物の製造方法において、前記曲げ加工が、前記木質調加飾シートを加熱しながら行われたものであることを特徴とする。   Moreover, the manufacturing method of the wood-like resin molding of this invention is the manufacturing method of the wood-like resin molding of Claim 7, as described in Claim 8, The said bending process WHEREIN: The said wood-tone decoration sheet | seat It is performed while heating.

本発明の木質調加飾シートによれば、従来技術品よりも少ない工程で生産でき、立体的な木質調樹脂成形物も煩雑な作業なしに、工業的な規模での迅速な製造が可能となる。   According to the woody decorative sheet of the present invention, it can be produced with fewer steps than the prior art product, and a three-dimensional woody resin molded product can be quickly manufactured on an industrial scale without complicated work. Become.

本発明の木質調加飾シートの製造方法によれば、木質調成形物を従来技術品よりも少ない工程で生産でき、立体的な木質調樹脂成形物も煩雑な作業なしに、工業的な規模での迅速な製造を可能とする木質調加飾シートを得ることができる。   According to the method for producing a wood-like decorative sheet of the present invention, a wood-like molded product can be produced in fewer steps than a conventional product, and a three-dimensional wood-like resin molded product can be produced on an industrial scale without complicated work. It is possible to obtain a wood-like decorative sheet that enables rapid production in

本発明の木質調樹脂成形物は、低コストでありながら、優れた木質調の外観を有する木質調樹脂成形物である。   The woody resin molded product of the present invention is a woody resin molded product having an excellent woody appearance at a low cost.

本発明の木質調樹脂成形物の製造方法によれば、優れた外観を有する木質成形物を低コストで製造することができる。   According to the method for producing a woody resin molded product of the present invention, a wood molded product having an excellent appearance can be produced at a low cost.

本発明の木質調加飾シートの製造方法、および、木質調加飾シートを用いた木質調樹脂成形物の製造方法を示すモデル図である。It is a model figure which shows the manufacturing method of the wooden tone decoration sheet of this invention, and the manufacturing method of the wooden tone resin molding using the wooden tone decoration sheet. 実施例における本発明の木質調加飾シートの絞り加工後の形状を示す斜視図である。It is a perspective view which shows the shape after a drawing process of the woody decor sheet of this invention in an Example.

本発明の木質調加飾シートは、上述のように、透明樹脂シート、接着剤層、および、木質層がこの順に積層されて構成され、かつ、前記接着剤層の接着剤の目付が70g/m2以上150g/m2以下である。 As described above, the woody decorative sheet of the present invention is configured by laminating a transparent resin sheet, an adhesive layer, and a wooden layer in this order, and the basis weight of the adhesive of the adhesive layer is 70 g / m 2 or more and 150 g / m 2 or less.

透明樹脂シート(図1中符号1)としては、ポリプロピレン、アクリル系樹脂、ポリエチレン樹脂、ポリカーボネートなどからなるシートが挙げられる。このうち、高透明性であり、成形性に優れ、かつ、最終製品である成形品に耐擦傷性、耐薬品性、及び、耐候性を付与することができるので、アクリル系樹脂フィルムからなることが好ましい。ここで、アクリル系樹脂としては、具体的には、メタクリル酸エステルを主体とする重合体であり、単独重合体としては、ポリメチルメタクリレート、ポリエチルメタクリレート、ポリブチルメタクリレート、ポリエチルヘキシルメタクリレート等が挙げられる。また、メタクリル酸エステルと他の単量体との共重合体であっても良く、そのようなものとしてポリメチルメタクリレート・スチレン共重合体等が挙げられる。さらに、メタクリル樹脂と一種またはそれ以上の他の樹脂とからなるポリマーアロイであっても良く、そのようなものとして、例えばポリメチルメタクリレート・ポリフッ化ビニリデンアロイ等が挙げられる。透明樹脂シートとしては通常は無色のものを用いるが、木質調を損なわない限り多少着色されたものを用いても良い。   Examples of the transparent resin sheet (reference numeral 1 in FIG. 1) include sheets made of polypropylene, acrylic resin, polyethylene resin, polycarbonate, and the like. Among these, it is made of an acrylic resin film because it is highly transparent, excellent in moldability, and can impart scratch resistance, chemical resistance, and weather resistance to the final molded product. Is preferred. Here, the acrylic resin is specifically a polymer mainly composed of methacrylic acid ester, and examples of the homopolymer include polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, polyethylhexyl methacrylate and the like. It is done. Further, it may be a copolymer of a methacrylic acid ester and another monomer, and examples thereof include a polymethyl methacrylate / styrene copolymer. Further, it may be a polymer alloy composed of a methacrylic resin and one or more other resins, and examples thereof include polymethyl methacrylate / polyvinylidene fluoride alloy. As the transparent resin sheet, a colorless sheet is usually used, but a slightly colored sheet may be used as long as the woody tone is not impaired.

透明樹脂シートの厚さとしては、最終的に立体的な形状を有する木質調の木質調樹脂成形物を得るためにはある程度の柔軟性が必要であり、そのために通常0.1mm以上3mm以下とする。さらに好ましい範囲としては0.3mm以上1mm以下である。   As the thickness of the transparent resin sheet, a certain degree of flexibility is necessary in order to finally obtain a wood-like wood-like resin molded product having a three-dimensional shape. To do. A more preferable range is 0.3 mm or more and 1 mm or less.

木質層を構成する木板は、合板製造時と同様にして、実際の原木からロータリーレース等によって得た木板や、スライサを用いて平削りによって得られた木板を用いることができ、後者によれば、美しい天然木目を得ることができる。あるいは、こうして得た木板の透明樹脂シート側とする面に印刷などによって木目模様を印刷することで、高級なニス塗り木板の外観を備えた本木目調加飾シートを得ることができる。なお、印刷時に、木目模様に合わせて徐々に濃褐色となるグラデーションを加えることにより、まさにヴァイオリンのような美しい外観を付与することも可能であり、この場合も当然本発明に含まれる。   The wood board constituting the wood layer can be a wood board obtained from an actual raw wood by rotary lace, etc., or a wood board obtained by planing using a slicer, as in the case of plywood production. You can get beautiful natural grain. Alternatively, by printing a wood grain pattern by printing or the like on the surface of the wood board thus obtained on the transparent resin sheet side, it is possible to obtain a genuine wood grain decoration sheet having the appearance of a high-quality varnished wood board. It is also possible to give a beautiful appearance just like a violin by adding a gradation that gradually becomes dark brown in accordance with the wood grain pattern at the time of printing, and this case is also included in the present invention.

木板の厚さとしては、最終的に立体的な形状を有する木質調の木質調樹脂成形物を得るためにはある程度の柔軟性が必要であり、そのために0.1mm以上1mm以下とすることが好ましい。さらに好ましい範囲としては0.2mm以上0.5mm以下である。   The thickness of the wood board requires a certain degree of flexibility in order to finally obtain a wood-like wood-like resin molded product having a three-dimensional shape. For this reason, it should be 0.1 mm or more and 1 mm or less. preferable. A more preferable range is 0.2 mm or more and 0.5 mm or less.

これら透明樹脂シート層と木質層との間に配する接着剤層を構成する接着剤としては最終的な木質調樹脂成形物を得るときの成形時の熱履歴に耐えられるものであることが必要であり、また、木質調を損なわないように無色透明ないし無色に近い透明な接着剤であることが必要である。   The adhesive constituting the adhesive layer placed between the transparent resin sheet layer and the wood layer should be able to withstand the heat history during molding when obtaining the final wood-like resin molding. In addition, it is necessary that the adhesive is colorless and transparent or nearly transparent so as not to impair the woody tone.

接着剤の粘度は3000mPa・S以上600Pa・S以下であることが、後述するプレス工程で樹脂自体が流れずに、木板の導管内に充填されるために、好ましい。   It is preferable that the viscosity of the adhesive is 3000 mPa · S or more and 600 Pa · S or less because the resin itself does not flow in the press step described later and is filled into the conduit of the wooden board.

接着剤は溶媒や分散媒を含まないものか、これらの含有量の少ないもの(不揮発分が30重量%以上のもの)が、後述する厚さとなるように塗りやすいので好ましい。   Adhesives that do not contain a solvent or a dispersion medium, or those having a small content (non-volatile content of 30% by weight or more) are preferable because they can be easily applied to a thickness described later.

このような接着剤として、例えば、酢酸ビニル系接着剤、シリル化ウレタン系接着剤、アクリル系接着剤などが挙げられるが、このうち、立体的な木質調樹脂成形物を得るために絞り加工を行う場合には、絞り加工での層間剥離が生じないのでシリル化ウレタン系接着剤であることが好ましい。   Examples of such adhesives include vinyl acetate adhesives, silylated urethane adhesives, acrylic adhesives, etc. Among them, drawing processing is performed to obtain a three-dimensional wood-like resin molded product. In the case of carrying out, it is preferable to use a silylated urethane adhesive because delamination does not occur in the drawing process.

接着剤は、透明樹脂シートに塗布しても、木板に塗布しても、あるいはこれら両方に塗布しても良い。ただし、タモ、オーク、ローズ、ゼブラなどの比較的木目が粗い木板を用いる場合には接着剤を塗布すると波状に変形しやすいので透明樹脂シートにのみ塗布することが望ましい。   The adhesive may be applied to the transparent resin sheet, the wooden board, or both. However, when using a wood board having a relatively rough grain, such as tamo, oak, rose, zebra, etc., it is desirable to apply only to the transparent resin sheet because it is easily deformed into a wave shape when an adhesive is applied.

接着剤の塗工目付としては木板の導管内に接着剤が充填される必要があるために70g/m2以上150g/m2以下とすることが必要である。比較的木目の細かい木板の場合にはこの範囲で少なめに塗工しても良好な外観を得ることができ、木目の粗い木板の場合にはこの範囲で多めに塗工することが好ましい。 The adhesive weight per unit area needs to be 70 g / m 2 or more and 150 g / m 2 or less because the adhesive needs to be filled in the conduit of the wooden board. In the case of a wooden board having a relatively fine grain, a good appearance can be obtained even if it is applied in a small amount in this range, and in the case of a wooden board having a rough grain, it is preferable to apply a large amount in this range.

接着剤はグラビア印刷法、あるいは木工用のスプレッダー、ディスペンサー、エアースプレー式塗布機などを用いて塗布することができる。   The adhesive can be applied using a gravure printing method, a wood spreader, a dispenser, an air spray type applicator or the like.

接着剤に溶剤が含まれている場合には塗布後に十分に乾燥してから、接着剤層(図1(b)符号2)を介して透明樹脂シート層と木質層とを積層して積層板(図1(c)中符号A。符号3は木質層)を得る(積層工程)。   When the adhesive contains a solvent, it is sufficiently dried after application, and then laminated with a transparent resin sheet layer and a wood layer via an adhesive layer (reference numeral 2 in FIG. 1 (b)). (Reference A in FIG. 1C. Reference 3 is a wood layer) (lamination step).

その後、前記積層板を加熱しながら加圧する(プレス工程)。このプレス工程により、接着剤が木質層を構成する木板の導管内に存在する空気を追い出して充填され、気泡のない美しい木質調外観が得られる。処理温度、処理圧力、そして、処理時間は用いる接着剤によって異なるが、通常はそれぞれ、30℃以上60℃以下、10kgf/cm2以上150kgf/cm2以下(1MPa以上15MPa以下)、10分以上30分以下の範囲とすることが好ましい。 Then, it pressurizes, heating the said laminated board (press process). By this pressing step, the adhesive is expelled and filled in air existing in the conduit of the wood board constituting the wood layer, and a beautiful wood-like appearance without bubbles is obtained. The treatment temperature, treatment pressure, and treatment time vary depending on the adhesive used, but usually 30 ° C. or more and 60 ° C. or less, 10 kgf / cm 2 or more and 150 kgf / cm 2 or less (1 MPa or more and 15 MPa or less), 10 minutes or more and 30 minutes, respectively. It is preferable to make it into the range below minutes.

このようにして本発明に係る木質調加飾シートが得られる。   Thus, the woody decorative sheet according to the present invention is obtained.

次いで、このような木質調加飾シートを用いて木質調樹脂成形物を得る方法について説明する。   Next, a method for obtaining a woody resin molded product using such a woody decorative sheet will be described.

上記木質調加飾シートを必要に応じて型抜きしたのち、立体的な木質調樹脂成形物を作製する場合には絞り加工(プレフォーミング)を行う。具体的には加熱しながら、2つの型との間で加圧しながら絞り加工(図1(d)参照 符号10、11はそれぞれ、上型、下型)を行う。温度としては通常130℃以上160℃以下程度で、加圧時間としては15秒以上30秒以下程度である。   After the above-mentioned wood-like decorative sheet is die-cut as necessary, when a three-dimensional wood-like resin molded product is produced, a drawing process (preforming) is performed. Specifically, drawing is performed while heating and pressurizing between two molds (refer to FIG. 1D, reference numerals 10 and 11 are an upper mold and a lower mold, respectively). The temperature is usually about 130 ° C. to 160 ° C., and the pressurization time is about 15 seconds to 30 seconds.

次いで、この木質調加飾シートをインサートとして金型内に収納し、木質調加飾シートの木質層側のキャビティ(図1(e)中符号14。図中13および15は金型)内に樹脂を射出成形して樹脂層を形成し成形品(図1(f)符号B。符号4は樹脂層)を得る。   Next, this wood-like decorative sheet is housed in a mold as an insert, and is placed in a cavity on the wood layer side of the wood-like decorative sheet (reference numeral 14 in FIG. 1 (e); 13 and 15 in the figure are molds). Resin is injection molded to form a resin layer to obtain a molded product (reference symbol B in FIG. 1 (f), reference numeral 4 is a resin layer).

以下に本発明の木質調加飾シートの実施例について具体的に説明する。   Examples of the woody decorative sheet of the present invention will be specifically described below.

<積層工程>
透明樹脂シートとして、厚さが800μmのアクリル樹脂(ポリメチルメタクリレート)製シートを用い、また、木質層となる木板としては厚さが0.3mmのタモ板を用い、木板の片面(透明樹脂シート側面となる面)にはグラビア印刷によって木目調の模様を印刷した。
<Lamination process>
An acrylic resin (polymethylmethacrylate) sheet having a thickness of 800 μm is used as the transparent resin sheet, and a tamo board having a thickness of 0.3 mm is used as the wooden layer, and one side of the wooden board (transparent resin sheet) On the side surface, a woodgrain pattern was printed by gravure printing.

接着剤としては表1に示すものを用いた。   The adhesive shown in Table 1 was used.

Figure 0005519364
Figure 0005519364

それぞれ木工用のスプレッダーを用いて上記木板の印刷面に接着剤の目付(乾燥後(固形分)目付)が、それぞれ表2に示したように塗布し、接着剤1および2を用いたサンプルではそのままの状態で、また、接着剤3〜5を用いたサンプルでは100℃に設定した乾燥機により2分間の乾燥処理を行った後に、これら接着剤層を介してそれぞれ木板と透明樹脂シートとを貼り合わせ、積層板を得た。   In the samples using adhesives 1 and 2, the weight per unit area of the adhesive (after drying (solid content) per unit area) was applied as shown in Table 2 using the spreader for woodworking. In the state as it is, and in the sample using the adhesives 3 to 5, after performing a drying process for 2 minutes with a dryer set at 100 ° C., the wooden board and the transparent resin sheet are respectively attached through these adhesive layers. The laminate was obtained by bonding.

Figure 0005519364
Figure 0005519364

<プレス工程>
これら積層板を50℃に設定したプレス装置で圧力:9MPaで10分間プレス処理を行い、9種類の木質調加飾シート(実施例1〜5、比較例1〜4)を得た。
<Pressing process>
These laminates were subjected to a press treatment at a pressure of 9 MPa for 10 minutes with a press apparatus set at 50 ° C. to obtain nine types of woody decorative sheets (Examples 1 to 5 and Comparative Examples 1 to 4).

このうち、比較例1に係る木質調加飾シートでは、樹脂層が厚くなってできた液だまりが透明樹脂シート側から観察され、斑状の外観不良が生じており、また、比較例2に係る木質調加飾シートでは樹脂不足から生じた導管部の気泡による外観不良が生じていた。このため、これら比較例1、および、比較例2に係る木質調加飾シートでの以降の検討は行わなかった。   Among these, in the woody decorative sheet according to Comparative Example 1, a liquid puddle formed by thickening the resin layer is observed from the transparent resin sheet side, causing a patchy appearance defect, and according to Comparative Example 2 In the wood-like decorative sheet, the appearance defect due to bubbles in the conduit portion caused by the lack of resin occurred. For this reason, the subsequent examination in the woody decorative sheet according to Comparative Example 1 and Comparative Example 2 was not performed.

<平板状木質調樹脂成形物の作製>
残る7種類の木質調加飾シートから型抜き加工を行って7cm×15cmの平板シートを得て、これらをそれぞれインサートとしてキャビティ内に収納し、これら平板シートの木質層側にABS樹脂を射出成形して厚さが2mmの樹脂層を形成し、7種類の木質調樹脂成形物を得た。
<Preparation of flat wood-like resin molding>
Die-cutting is performed from the remaining 7 types of wood-like decorative sheets to obtain 7 cm x 15 cm flat sheets, which are respectively stored in cavities as inserts, and ABS resin is injection-molded on the wooden layer side of these flat sheets Thus, a resin layer having a thickness of 2 mm was formed to obtain seven types of woody resin moldings.

これら木質調樹脂成形物について自動車内装での長期間での耐熱履歴を想定した105℃・500時間の耐熱試験を行った。この試験前後で外観に変化がなくかつ試験後の成形物に剥離が全く生じていないときを耐熱性が充分であるとして「○」、白化や剥離(部分的な隔離を含む)が生じたときを耐熱性が不充分であるとして「×」として評価した。   These wood-like resin molded products were subjected to a heat resistance test at 105 ° C. for 500 hours assuming a long-term heat resistance history in the interior of an automobile. When there is no change in appearance before and after this test and no peeling occurs on the molded product after the test, “○” indicates that the heat resistance is sufficient, and when whitening or peeling (including partial isolation) occurs Was evaluated as “x” because the heat resistance was insufficient.

また、上記耐熱試験を合格したサンプルに対して、使用される地域での温度環境を想定した耐熱サイクル試験を行った。   Moreover, the heat cycle test which assumed the temperature environment in the area used was performed with respect to the sample which passed the said heat test.

すなわち、90℃・4時間、室温・0.5時間、−40℃・1.5時間、さらに、室温・0.5時間の熱履歴を1サイクルとして10サイクル繰り返した。この耐熱サイクル性試験後、成形物に外観変化も剥離も全く生じなかったときを耐熱サイクル性が充分であるとして「○」、外観変化や部分的にも層間に剥離が生じた場合には耐熱サイクル性が不充分であるとして「×」として評価した。これら結果を表2に併せて記載する。   That is, 90 cycles of 90 ° C. for 4 hours, room temperature of 0.5 hours, −40 ° C. for 1.5 hours, and a thermal history of room temperature of 0.5 hours were repeated 10 cycles. After this heat cycle test, if the molded product had no change in appearance or peeling, the heat cycle was considered to be sufficient, and if the change in appearance or partial delamination occurred, It was evaluated as “x” because the cycleability was insufficient. These results are also shown in Table 2.

<立体木質調樹脂成形物の作製>
上記7種類の木質調加飾シート(実施例1〜5、比較例3および比較例4)から型抜き加工を行って8cm×15cmの平板シートを得て、これらを図2に示す形状に絞り加工を行った。このとき加熱温度は150℃で、処理時間は20秒であった。
<Preparation of three-dimensional wood-like resin molding>
A die-cutting process is performed from the above seven kinds of woody decorative sheets (Examples 1 to 5, Comparative Example 3 and Comparative Example 4) to obtain a flat sheet of 8 cm × 15 cm, and these are drawn into the shape shown in FIG. Processing was performed. At this time, the heating temperature was 150 ° C. and the treatment time was 20 seconds.

絞り加工後の木質調加飾シートを観察したところ、比較例3および比較例4の木質調加飾シートでは層間で剥離が生じており、実用に耐えられないものであった。このためにこれら2つの木質調加飾シートでは以降の検討を行わなかった。   When the woody decorative sheet after drawing was observed, the woody decorative sheets of Comparative Example 3 and Comparative Example 4 were peeled off between the layers and could not be put into practical use. For this reason, the following examination was not performed on these two woody decorative sheets.

上記実施例の絞り加工後の木質調加飾シートを用いて、これらをそれぞれインサートとしてキャビティ内に収納し、これら平板シートの木質層側にABS樹脂を射出成形して厚さが2〜4mmの樹脂層(厚さが部分的に異なる)を形成し、5種類の本発明に係る木質調樹脂成形物を得た。   Using the wood-like decorative sheets after the drawing process of the above-described embodiment, these are respectively stored as cavities in the cavity, and ABS resin is injection-molded on the wood layer side of these flat sheets, and the thickness is 2 to 4 mm. Resin layers (thicknesses differing partially) were formed to obtain five types of wood-like resin moldings according to the present invention.

これら本発明に係る木質調樹脂成形物は外観においても良好で、また、耐熱試験結果、および、熱サイクル試験(それぞれ結果を表2に併せて記載する)結果においても充分な結果が得られた。   These wood-like resin moldings according to the present invention are good in appearance, and sufficient results are obtained in the results of the heat resistance test and the heat cycle test (the results are also described in Table 2). .

A 本発明に係る木質調加飾シート
B 本発明に係る木質調樹脂成形物
1 透明樹脂シート
2 接着剤層
3 木質層
4 樹脂層
A Wood-like decorative sheet according to the present invention B Wood-like resin molded product according to the present invention 1 Transparent resin sheet 2 Adhesive layer 3 Wood layer 4 Resin layer

Claims (8)

透明樹脂シート、接着剤層、および、木質層がこの順に積層されて構成され前記接着剤層の接着剤がシリル化ウレタン系接着剤であり、かつ、前記接着剤層の接着剤の目付が70g/m2以上150g/m2以下であることを特徴とする木質調加飾シート。 A transparent resin sheet, an adhesive layer, and, wood layers are stacked in this order, the adhesive of the adhesive layer is a silylated urethane adhesive, and the basis weight of the adhesive of the adhesive layer A woody decorative sheet characterized by being 70 g / m 2 or more and 150 g / m 2 or less. 上記木質層厚さが0.1mm以上1mm以下であることを特徴とする請求項1に記載の木質調加飾シート。   The woody decorative sheet according to claim 1, wherein the wood layer thickness is 0.1 mm or more and 1 mm or less. 上記木質層の透明樹脂シート側面に木目調印刷が施されていることを特徴とする請求項1または請求項2に記載の木質調加飾シート。   The woody decorative sheet according to claim 1 or 2, wherein a woodgrain print is applied to a side surface of the transparent resin sheet of the woody layer. 透明樹脂シートに接着剤の目付が70g/m2以上150g/m2以下の接着剤層を介して木質シートを積層して積層板を得る積層工程と、前記積層板を加熱しながら加圧するプレス工程と、をこの順で備えたことを有する木質調加飾シートの製造方法。 A laminating step of laminating a wooden sheet through an adhesive layer having an adhesive basis weight of 70 g / m 2 or more and 150 g / m 2 or less on a transparent resin sheet, and a press for pressing the laminate while heating the laminate The manufacturing method of the woody decoration sheet | seat which has a process in this order. 請求項1ないし請求項3のいずれか1項に記載の木質調加飾シートがインサートとしてキャビティ内に収納されて射出成形されたことを特徴とする木質調樹脂成形物。 A wood-like resin molded article, wherein the wood-like decorative sheet according to any one of claims 1 to 3 is housed in a cavity as an insert and injection-molded . 請求項1ないし請求項3のいずれか1項に記載の木質調加飾シートをインサートとして、該木質調加飾シートの木質層側に樹脂を射出成形することを特徴とする木質調樹脂成形物の製造方法。   A wood-like resin molded article, wherein the wood-like decorative sheet according to any one of claims 1 to 3 is used as an insert, and a resin is injection-molded on the wood layer side of the wood-like decorative sheet. Manufacturing method. 前記射出成形前の前記木質調加飾シートが、曲げ加工されていることを特徴とする請求項6に記載の木質調樹脂成形物の製造方法。   The method for producing a woody resin molded product according to claim 6, wherein the woody decorative sheet before the injection molding is bent. 前記曲げ加工が、前記木質調加飾シートを加熱しながら行われたものであることを特徴とする請求項7に記載の木質調樹脂成形物の製造方法。   The method for producing a woody resin molded product according to claim 7, wherein the bending is performed while heating the woody decorative sheet.
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