JP4406494B2 - Manufacturing method of skin integral molding - Google Patents
Manufacturing method of skin integral molding Download PDFInfo
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- JP4406494B2 JP4406494B2 JP2000100491A JP2000100491A JP4406494B2 JP 4406494 B2 JP4406494 B2 JP 4406494B2 JP 2000100491 A JP2000100491 A JP 2000100491A JP 2000100491 A JP2000100491 A JP 2000100491A JP 4406494 B2 JP4406494 B2 JP 4406494B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、表皮一体成形品の製造方法に関し、特に通気性を有する表皮を金型内に配置し、溶融樹脂を金型内に充填することで表皮の裏面側に表皮と一体的に接合した基材を形成する外観の優れる表皮一体成形品の製造方法に関する。
【０００２】
【従来の技術】
従来より、ポリオレフィン系熱可塑性樹脂基材に表皮を積層することにより、その美観、ソフト感等を高めて高級化した成形品は広く用いられている。これらの表皮付き成形品を製造する方法としては、表皮材を成形用の雌雄一対からなる金型間に設置し、金型を閉じた後加熱溶融した熱可塑性樹脂を金型のゲートより金型内に射出して前記表皮材と積層させ、冷却後金型を開いて成形品を取り出す方法が知られている。
【０００３】
しかしながら、表皮材が通気性を有する場合、表皮層表面に溶融樹脂がしみ出して、成形品表面の光沢が上昇したり、表皮材が硬化するなど風合いを損なうことで、商品価値をなくしてしまう問題がある。前記のような欠点あるいは表皮の柔軟性が損なわれるような問題に対し、しみ出しが生じない程度の低い成形圧力で成形することや、表皮と熱可塑性樹脂の間にプラスチックフォームを介在させたり、紙あるいは緻密なプラスチックフォーム等のようなバックアップシートを断熱材とか樹脂遮蔽材として使用することが提案されている。（特開昭６０−２１２３４３号公報、同５７−２９４３６号公報）
【０００４】
前者の提案では、ひずみの少ない成形品を得にくかったり、成形品の厚みが薄いと成形自体が困難となる。また後者の提案では、プラスチックフォームのみを介在させた場合には溶融樹脂の熱と圧力とによってフォームが破壊され、その際表皮と接触するフォームの面に激しい凹凸が生じ、それが表皮層の表面に転写されて外観を損なうとともに触感も悪化する。また、紙や緻密なプラスチックフォーム等のような剛性があり、伸びの比較的小さいバックアップシートを介在させた場合には成形品が複雑形状の場合には成形時に部分的に破れたり、反ったりして外観を損なう。また、熱可塑性樹脂と同種のプラスチックよりなる保護層を形成した表皮材を用いることも提案されている（特開昭５４−７１１６１号公報）。しかしながら、これらバッキング材あるいは保護層を使用した場合には表皮の外観を保つことはできるが成形品に反りが発生し、商品価値を失い易かったり、コストが嵩むといった問題があった。
【０００５】
【発明が解決しようとする課題】
本発明の目的は、通気性を有する表皮を金型内に配置し溶融樹脂を該金型内に射出することで該表皮の裏面側に該表皮と一体的に接合した樹脂基材を形成する表皮一体成形品の製造方法において、表皮からしみ出した樹脂による成形品表面の光沢の上昇、風合い低下を防止し、高品質の表皮一体成形品の製造方法を提供することにある。
【０００６】
【課題を解決するための手段】
本発明者は、上記課題を解決すべく鋭意研究した結果、通気性を有する表皮を用いた一体成形品の製造において、凹凸面を内面に有する金型を用いることにより、溶融樹脂の表皮からのしみ出しを防ぐことができることを見出し、本発明を完成した。すなわち、本発明は、表皮を金型内に配置し、溶融樹脂を該金型内に射出することで、該表皮の裏面上に該表皮と一体的に接合した樹脂基材を形成する表皮一体成形品を製造する方法において、前記表皮が通気性を有し、かつ前記金型として該表皮に表面が当接する金型表面に凹凸面が形成されたものを用いることを特徴とする表皮一体成形品の製造方法である。
【０００７】
【発明の実施の形態】
以下、具体的に本発明について説明する。
本発明において、樹脂基材として使用される溶融樹脂は、圧縮成形、射出成形、発泡成形あるいは押出成形などにおいて通常使用されている熱可塑性樹脂のいずれも用いることができる。かかる熱可塑性樹脂として、例えば、ＨＩＰＳ、ＡＢＳなどのスチレン系樹脂、６ナイロン、６６ナイロンなどのポリアミド樹脂、ポリエチレンテレフタレート、ポリブチレンテレフタレートなどのポリエステル樹脂、高密度ポリエチレン等各種ポリエチレン、ポリプロピレン、プロピレンを主成分とする各種共重合体、各種ポリオレフィン系ポリマーアロイまたはこれらの混合物などのポリオレフィン系樹脂等が挙げられる。
このような熱可塑性樹脂には、無機充填剤、ガラス繊維等の各種充填剤、顔料、滑剤、帯電防止剤、安定剤、発泡剤などの各種添加剤を必要に応じて配合することができる。
【０００８】
本発明に用いられる表皮は、通気性を有するものであり、自動車内装材や電気製品用の成形体を目的とする場合には装飾性を有し、ソフト感のあるものが好ましく用いられる。かかる特性を備えている表皮として、織布や不織布などが挙げられる。
織布を構成する繊維は綿、麻、毛、絹等の天然繊維はもちろんのこと、ポリアミド、ポリエステル等の合成繊維も使用することができ、これらの繊維は単独であるいは混紡して種々の方法により織布とすることができ、このような織布としては、平織り、モケット、トリコット、ソフトウェーブなどの織物やトリコット、ダブルラッセル、ジャージなどの編物を挙げることができる。
また、不織布は天然繊維からのものであっても合成繊維からのものであっても使用することができ、その製造方法も限定されることはない。
【０００９】
本発明に用いられる表皮にはピンホール様の通気孔を施した皮革シートや樹脂シートも含まれる。樹脂シートとしてはＴＰＯシート、塩化ビニル系樹脂シートが代表的であり、かかる塩化ビニル系樹脂シートは、塩化ビニル重合体、塩化ビニルを主成分とする塩化ビニル系共重合体またはこれらの混合物に必要に応じて他の熱可塑性樹脂、安定剤、可塑剤等の各種添加剤、配合剤を適宜加えて得られる塩化ビニル系樹脂組成物を、カレンダー法、連続押出成形法等によってシート化することによって製造される。シートの厚みは０．０１〜２ｍｍ、特に０．０１〜１ｍｍが好ましい。
【００１０】
皮革シート、樹脂シートに施す通気孔の直径は０．５〜５ｍｍ、好ましくは１〜３ｍｍが好ましい。また該通気孔の数は１０００〜１０００００個／ｍ２、好ましくは５０００〜５００００個／ｍ２が望ましい。
【００１１】
本発明に用いられる通気性を有する表皮材には、バックアップシート、発泡層が裏打ちされていても良い。バックアップシート、発泡層は公知のものが使用できる。裏打ち方法としては、たとえばこのようなバックアップシート、発泡層をＴダイシート製造装置にて製造し、これを接着剤を用いて表皮裏面に貼り合わせてもよいし、該シートをＴダイシート製造装置で製造しながら表皮材にラミネートしてもよい。なお、かかるシートの厚みは特に限定されないが、薄すぎると、成形に際しての溶融ポリオレフィン系熱可塑性樹脂の供給時に該溶融樹脂の熱と供給圧力で破れ易くなったり、破れないまでも断熱効果が不十分になって表皮の外観を損ない易く、また、厚すぎると溶融樹脂による該シートへの加熱が不十分となって該シートと基材となる熱可塑性樹脂との接着性が低下し易くなることから、好ましくは０．１〜１ｍｍ程度である。
【００１２】
本発明に用いられる金型は、前記表皮の表面が当接するキャビティ面に凹凸面が形成されたものである。金型は、鉄又は鉄を主成分とする鋼材、アルミニウム又はアルミニウムを主成分とする合金、ＺＡＳ等の亜鉛合金、ベリリウム−銅合金等の一般に熱可塑性樹脂の成形に使用されるものであれば特に限定されないが、鋼材からなる金型が良好に使用できる。これらの金属からなる金型のキャビティ表面は、硬質クロムやニッケルなどでメッキされていても良い。
【００１３】
ここでキャビティ面に形成される凹凸面としては、格子状、ショットブラスト、シボなどが挙げられる。この中でもシボが好ましく、シボパターンとして皮革の皺模様、布模様、木目模様、ヘアーライン模様、梨地模様などが例示できる。
【００１４】
シボパターンを金型表面に形成するには、ブラスト法、エッチング法、あるいはサンドペーパーや砥石などによる表面研削法等が挙げられる。特に光沢を押さえる意味でホーニングシボ・ショットブラストが好ましい。
【００１５】
凹凸面の深さは、キャビティ表面の光沢を抑えられれば特に限定されないが、通常、最大深さ（Ｒｍａｘ）が１〜１０００μｍ、好ましくは１０〜５００μｍ、特に好ましくは５０〜１５０μｍである。また、キャビティ表面の光沢は、ＪＩＳ−Ｋ７１０５に準拠して測定したグロス値で、３０以下、更には１５以下、特に５以下が好ましい。
【００１６】
上記のようなキャビティ表面に凹凸が形成された金型を用いることで、表皮からしみ出した樹脂によって、表皮を硬化させたり、光沢の著しい上昇をさせることなく、高い風合いを有した表皮一体成形品を製造することができる。
【００１７】
表皮一体成形品の製造方法としては、表皮を金型内に配置する工程及び該金型内に溶融樹脂を充填する工程を含む表皮一体成形品の製造方法であれば公知の方法を採用しうる。具体的には、（１）表皮を金型内に配置した後、金型を閉じ該金型内に溶融樹脂を射出し、冷却固化させて表皮一体成形品を得る射出成形、（２）表皮を金型内に配置した後、金型を途中まで閉じ該金型内に溶融樹脂を射出し、さらに金型を閉じ賦型冷却固化させて表皮一体成形品を得る射出圧縮成形、（３）表皮を金型内に配置した後、該金型内に溶融樹脂を押出し金型を閉じ賦型冷却固化させて表皮一体成形品を得るフロースタンピング成形、さらに前記各方法における溶融樹脂に発泡剤を配合したものを用い、賦型後該金型を開くことで基材層の発泡を促進させる工程を組み合わせた（４）射出発泡成形、（５）射出圧縮発泡成形、（６）フロースタンピング発泡成形等が挙げられる。
【００１８】
本発明による光沢の上昇が抑えられた成形品は、特に自動車内装部材、家電部材、住宅内層部材（パーテーション）等に好適に使用される。
【００１９】
【実施例】
以下、実施例によって、本発明を更に詳細に説明する。なお、成形品の表面光沢（グロス）の評価は、ミノルタ社製ＵＮＩ−ＧＬＯＳＳ６０にて、ＪＩＳ−Ｋ７１０５に準拠して測定した。
【００２０】
実施例１
金型キャビティ形状が３５０ｍｍ×２００ｍｍ×３ｍｍｔで、キャビティ内面に皮シボ（グレインＣ：凹凸の最大深さＲｍａｘ＝１００μｍ、グロス＝１．０％）パターンが施された金型内に、表皮として平織り織布を配置し、ＭＦＲが３０ｇ／１０分のポリプロピレン樹脂（日本ポリケム社製ノバテックＰＰＢＣ０３Ｂ）を樹脂温度２１０℃で、表皮設置後の型開き量１０ｍｍのキャビティ容量分を金型（金型温度６０℃）に射出し、射出後直ちに圧縮（型締め圧最大値３００ｔ）した。冷却固化後、型開きし表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２１】
実施例２
金型キャビティ内面に梨地（凹凸の最大深さＲｍａｘ＝８０μｍ、グロス＝１．０％）パターンが施された金型を用いる以外は、実施例１と同様にして表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２２】
実施例３
表皮として、ジャージを用いた以外は、実施例１と同様にして表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２３】
比較例１
金型キャビティ内面に鏡面（Ｎｉメッキ、グロス＞１００％）が施された金型を用いる以外は、実施例１と同様にして表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２４】
比較例２
金型キャビティ内面に鏡面（Ｎｉメッキ、グロス＞１００％）が施された金型を用いる以外は、実施例３と同様にして表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２５】
実施例４
キャビティ形状が３５０ｍｍ×２００ｍｍ×３ｍｍｔで、金型キャビティ内面に皮シボ（凹凸の最大深さＲｍａｘ＝１００μｍ、グロス＝１．０％）パターンが施された金型に、表皮として平織り織布を配置し、ＭＦＲが３０ｇ／１０分のポリプロピレン樹脂（日本ポリケム社製ノバテックＰＰＢＣ０３Ｂ）を樹脂温度２１０℃で、表皮設置後型を閉じた金型（金型温度６０℃）に、射出圧力８００ｋｇｆ／ｃｍ２、型締め圧力５００ｔにて射出した。冷却固化後、型開きし表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２６】
比較例３
金型キャビティ内面に鏡面（Ｎｉメッキ、グロス＞１００％）が施された金型を用いる以外は、実施例３と同様にして表皮一体成形品を得た。得られた成形品の光沢を測定した。結果を表１に示す。
【００２７】
【表１】
【発明の効果】
本発明の表皮一体成形品の製造方法は、表皮の表面が当接する金型表面に凹凸面が形成されているので、通気性を有する表皮を用いても、表皮からしみ出した樹脂による成形品表面の光沢の上昇、風合い低下を防止し、高品質の表皮一体成形品を得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a skin-integrated molded article, and in particular, a breathable skin is disposed in a mold, and molten resin is filled in the mold so that the skin is integrally bonded to the back side of the skin. The present invention relates to a method for producing a skin-integrated molded article having excellent appearance and forming a substrate.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a molded product that has been enhanced by enhancing its aesthetics, soft feeling, etc. by laminating a skin on a polyolefin-based thermoplastic resin substrate has been widely used. As a method of manufacturing these molded products with a skin, the skin material is placed between a pair of male and female molds for molding, and the mold is closed and heated and melted thermoplastic resin from the mold gate. There is known a method of injecting and laminating with the skin material, opening a mold after cooling, and taking out a molded product.
[0003]
However, when the skin material has air permeability, the molten resin oozes out on the surface of the skin layer, and the gloss of the surface of the molded product is increased, or the skin material is hardened. There's a problem. For the above-mentioned drawbacks or problems that damage the flexibility of the skin, molding at a low molding pressure that does not cause bleeding, or interposing a plastic foam between the skin and the thermoplastic resin, It has been proposed to use a backup sheet such as paper or dense plastic foam as a heat insulating material or a resin shielding material. (Japanese Patent Laid-Open Nos. 60-212343 and 57-29436)
[0004]
In the former proposal, it is difficult to obtain a molded product with little distortion, or molding itself becomes difficult if the thickness of the molded product is thin. According to the latter proposal, when only plastic foam is interposed, the foam is destroyed by the heat and pressure of the molten resin, and the surface of the foam that comes into contact with the skin is severely uneven, which is the surface of the skin layer. The appearance is impaired and the tactile sensation is also deteriorated. In addition, if there is a backup sheet that has rigidity such as paper or dense plastic foam and has a relatively small elongation, if the molded product has a complicated shape, it may be partially torn or warped during molding. Damage the appearance. It has also been proposed to use a skin material in which a protective layer made of the same kind of plastic as the thermoplastic resin is formed (Japanese Patent Laid-Open No. 54-71161). However, when these backing materials or protective layers are used, the appearance of the skin can be maintained, but there is a problem that the molded product is warped, the commercial value is easily lost, and the cost is increased.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to form a resin base material integrally joined to the skin on the back side of the skin by disposing a skin having air permeability in the mold and injecting molten resin into the mold. An object of the present invention is to provide a method for producing a high-quality skin-integrated molded article by preventing an increase in gloss and texture of the surface of the molded article due to a resin oozing out from the skin.
[0006]
[Means for Solving the Problems]
As a result of earnest research to solve the above problems, the present inventor, in the production of an integrally molded product using a breathable skin, by using a mold having an uneven surface on the inner surface, The present invention has been completed by finding out that bleeding can be prevented. That is, the present invention provides an integral skin epidermis was placed in a mold, to form by injecting molten resin into gold inner mold, the epidermis and integrally bonded to the resin substrate on the back surface of the epidermis In the method for producing a molded product , the skin is molded integrally with the skin, wherein the skin has air permeability, and the mold has an uneven surface formed on the surface of the mold in contact with the surface. Product manufacturing method.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be specifically described below.
In the present invention, as the molten resin used as the resin base material, any thermoplastic resin usually used in compression molding, injection molding, foam molding or extrusion molding can be used. Examples of such thermoplastic resins include styrene resins such as HIPS and ABS, polyamide resins such as 6 nylon and 66 nylon, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, various polyethylenes such as high density polyethylene, polypropylene, and propylene. Examples include various copolymers as components, polyolefin resins such as various polyolefin polymer alloys, and mixtures thereof.
Various additives such as inorganic fillers, various fillers such as glass fibers, pigments, lubricants, antistatic agents, stabilizers, foaming agents and the like can be blended with such thermoplastic resins as necessary.
[0008]
The skin used in the present invention has air permeability, and when it is intended for automobile interior materials and molded articles for electrical products, those having a decorative property and a soft feeling are preferably used. Examples of the skin having such characteristics include woven fabric and non-woven fabric.
Natural fibers such as cotton, hemp, wool, and silk as well as synthetic fibers such as polyamide and polyester can be used as the fibers constituting the woven fabric. These fibers can be used alone or in various ways by blending them. As such a woven fabric, woven fabrics such as plain weaves, moquettes, tricots, and soft waves, and knitted fabrics such as tricots, double raschels, and jerseys can be used.
In addition, the nonwoven fabric can be used from natural fibers or synthetic fibers, and the production method thereof is not limited.
[0009]
The skin used in the present invention includes a leather sheet or a resin sheet provided with pinhole-like air holes. Typical examples of resin sheets include TPO sheets and vinyl chloride resin sheets. Such vinyl chloride resin sheets are necessary for vinyl chloride polymers, vinyl chloride copolymers based on vinyl chloride, or mixtures thereof. By adding various additives such as other thermoplastic resins, stabilizers, plasticizers, and compounding agents as appropriate according to the above, the vinyl chloride resin composition obtained by sheeting by a calendar method, continuous extrusion molding method, etc. Manufactured. The thickness of the sheet is preferably 0.01 to 2 mm, particularly preferably 0.01 to 1 mm.
[0010]
The diameter of the air holes provided in the leather sheet and the resin sheet is 0.5 to 5 mm, preferably 1 to 3 mm. The number of the air holes is 1000 to 100,000 / m 2 , preferably 5000 to 50000 / m 2 .
[0011]
The air-permeable skin material used in the present invention may be backed with a backup sheet or a foamed layer. Known backup sheets and foamed layers can be used. As a backing method, for example, such a back-up sheet and a foam layer may be manufactured with a T-die sheet manufacturing apparatus, and this may be bonded to the back surface of the skin using an adhesive, or the sheet may be manufactured with a T-die sheet manufacturing apparatus. However, it may be laminated on the skin material. The thickness of the sheet is not particularly limited, but if it is too thin, the molten polyolefin-based thermoplastic resin may be easily broken by the heat and supply pressure of the molten resin at the time of molding, or the heat insulation effect will not be improved until it is not broken. When the thickness is too thick, heating of the sheet with the molten resin is insufficient, and the adhesiveness between the sheet and the thermoplastic resin serving as a base material is likely to decrease. Therefore, it is preferably about 0.1 to 1 mm.
[0012]
The metal mold used in the present invention has a concavo-convex surface formed on the cavity surface with which the surface of the skin comes into contact. As long as the mold is generally used for molding a thermoplastic resin such as iron or a steel material mainly containing iron, aluminum or an alloy mainly containing aluminum, a zinc alloy such as ZAS, or a beryllium-copper alloy. Although not particularly limited, a mold made of steel can be used favorably. The cavity surface of a mold made of these metals may be plated with hard chrome or nickel.
[0013]
Here, examples of the uneven surface formed on the cavity surface include a lattice shape, a shot blast, and a texture. Of these, the texture is preferable, and examples of the texture pattern include leather wrinkle patterns, cloth patterns, wood grain patterns, hairline patterns, and satin patterns.
[0014]
In order to form the embossed pattern on the mold surface, a blasting method, an etching method, or a surface grinding method using sandpaper or a grindstone can be used. Honing texture and shot blasting are particularly preferable in terms of suppressing gloss.
[0015]
The depth of the concavo-convex surface is not particularly limited as long as the gloss of the cavity surface can be suppressed, but usually the maximum depth (R max ) is 1-1000 μm, preferably 10-500 μm, and particularly preferably 50-150 μm. The gloss of the cavity surface is a gloss value measured according to JIS-K7105, preferably 30 or less, more preferably 15 or less, and particularly preferably 5 or less.
[0016]
By using a mold with irregularities formed on the surface of the cavity as described above, the skin integrated with the resin exuded from the skin, with a high texture without hardening the skin or significantly increasing the gloss Product can be manufactured.
[0017]
As a method for producing a skin-integrated molded product, a known method can be adopted as long as it is a method for producing a skin-integrated molded product including a step of placing a skin in a mold and a step of filling a molten resin into the mold. . Specifically, (1) after the skin is placed in the mold, the mold is closed, the molten resin is injected into the mold, and cooled and solidified to obtain an integrally molded product of the skin, (2) the skin Is placed in the mold, and then the mold is closed halfway, the molten resin is injected into the mold, the mold is further closed, and the mold is cooled and solidified to obtain an integral skin molded product, (3) After the skin is placed in the mold, the molten resin is extruded into the mold, the mold is closed, and the mold is closed and cooled and solidified to obtain a skin integral molded product. Further, a foaming agent is added to the molten resin in each of the above methods. (4) Injection foam molding, (5) Injection compression foam molding, (6) Flow stamping foam molding, which uses a blended material and combines the steps of promoting foaming of the base material layer by opening the mold after shaping. Etc.
[0018]
The molded product in which the increase in gloss according to the present invention is suppressed is particularly suitably used for automobile interior members, home appliance members, house inner layer members (partitions) and the like.
[0019]
【Example】
Hereinafter, the present invention will be described in more detail by way of examples. In addition, evaluation of the surface gloss (gloss) of a molded article was measured based on JIS-K7105 by UNI-GLOSS60 by Minolta.
[0020]
Example 1
The mold cavity shape is 350 mm x 200 mm x 3 mmt, and the inner surface of the cavity has a skin texture (grain C: maximum depth of irregularities R max = 100 μm, gloss = 1.0%) as a skin. Place a plain woven fabric, polypropylene resin (Novatech PPBC03B manufactured by Nippon Polychem Co., Ltd.) with an MFR of 30 g / 10 min at a resin temperature of 210 ° C., and mold cavity (mold temperature) 60 ° C.) and immediately after the injection, it was compressed (the maximum clamping pressure was 300 t). After cooling and solidification, the mold was opened to obtain an integrally molded skin. The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0021]
Example 2
A skin-integrated molded article was obtained in the same manner as in Example 1 except that a mold having a satin texture (maximum unevenness depth R max = 80 μm, gloss = 1.0%) pattern was used on the inner surface of the mold cavity. . The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0022]
Example 3
A skin integrated product was obtained in the same manner as in Example 1 except that a jersey was used as the skin. The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0023]
Comparative Example 1
A skin integrated product was obtained in the same manner as in Example 1 except that a mold having a mirror surface (Ni plating, gloss> 100%) on the inner surface of the mold cavity was used. The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0024]
Comparative Example 2
A skin integrated molded product was obtained in the same manner as in Example 3 except that a mold having a mirror surface (Ni plating, gloss> 100%) on the inner surface of the mold cavity was used. The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0025]
Example 4
A plain woven cloth is used as the skin for a mold having a cavity shape of 350 mm × 200 mm × 3 mmt and a pattern with a leather texture (maximum unevenness depth R max = 100 μm, gloss = 1.0%) on the inner surface of the mold cavity. A polypropylene resin (Novatec PPBC03B manufactured by Nippon Polychem Co., Ltd.) with an MFR of 30 g / 10 min was placed at a resin temperature of 210 ° C., and the mold was closed after the skin was placed (mold temperature 60 ° C.), injection pressure 800 kgf / cm 2. Injection was performed at a mold clamping pressure of 500 t. After cooling and solidification, the mold was opened to obtain an integrally molded skin. The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0026]
Comparative Example 3
A skin integrated molded product was obtained in the same manner as in Example 3 except that a mold having a mirror surface (Ni plating, gloss> 100%) on the inner surface of the mold cavity was used. The gloss of the obtained molded product was measured. The results are shown in Table 1.
[0027]
[Table 1]
【The invention's effect】
In the method for producing a skin-integrated molded product according to the present invention, since a concavo-convex surface is formed on the mold surface with which the surface of the skin contacts, a molded product made of resin that exudes from the skin even if a skin having air permeability is used. An increase in surface gloss and a decrease in texture can be prevented, and a high-quality skin-integrated molded product can be obtained.
Claims (4)
前記表皮が通気性を有し、かつ前記金型として該表皮の表面が当接する金型表面に凹凸面が形成されたものを用いることを特徴とする表皮一体成形品の製造方法。Epidermis was placed in a mold, by injecting molten resin into gold inner mold, a method of manufacturing the integral skin molded article to form the epidermis and integrally bonded to the resin substrate on the back surface of the epidermis In
A method for producing a skin-integrated molded product, wherein the skin has air permeability, and the mold has a rugged surface formed on a mold surface with which the surface of the skin abuts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000100491A JP4406494B2 (en) | 2000-04-03 | 2000-04-03 | Manufacturing method of skin integral molding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000100491A JP4406494B2 (en) | 2000-04-03 | 2000-04-03 | Manufacturing method of skin integral molding |
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| Publication Number | Publication Date |
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| JP2001277290A JP2001277290A (en) | 2001-10-09 |
| JP4406494B2 true JP4406494B2 (en) | 2010-01-27 |
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| JP2000100491A Expired - Fee Related JP4406494B2 (en) | 2000-04-03 | 2000-04-03 | Manufacturing method of skin integral molding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AU2004229041B2 (en) | 2003-12-30 | 2011-01-20 | Lg Electronics Inc. | Door of drum-type washing machine, method of manufacturing door with hairline sheet of drum-type washing machine, and method of manufacturing hairline sheet for door |
| JP4797570B2 (en) * | 2004-10-27 | 2011-10-19 | 住友化学株式会社 | Production method of polypropylene resin injection molded body |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5983633A (en) * | 1982-11-04 | 1984-05-15 | Sumitomo Chem Co Ltd | Preparation of multiple molded product having decorative pattern |
| JPS61132314A (en) * | 1984-11-30 | 1986-06-19 | Toyota Motor Corp | Manufacture of resin item with integral skin |
| JPS6330217A (en) * | 1986-07-25 | 1988-02-08 | Meiwa Sangyo Kk | Manufacture of laminated molded material provided with decorating sheet |
| JPS6341116A (en) * | 1986-08-07 | 1988-02-22 | Meiwa Sangyo Kk | Manufacture of laminated molding with decorative sheet |
| JPH07276395A (en) * | 1994-04-08 | 1995-10-24 | Sintokogio Ltd | Production of resin molded article with skin |
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