JP6431060B2 - 電子写真方式の付加製造システム用の半結晶消耗材 - Google Patents
電子写真方式の付加製造システム用の半結晶消耗材 Download PDFInfo
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Description
別途指定されない限り、本明細書で使用される以下の用語は、以下で規定される意味を有する。
本明細書で述べる部品材料及び支持材料の種々の特性及び特徴は、以下で述べる種々の試験手法によって評価することができる:
ガラス転移温度は、示差走査熱量計(DSC:Differential Scanning Calorimetry)ASTM D3418−12e1を使用する古典的なASTM法を使用して決定され、摂氏で報告される。試験は、支持材料コポリマーの10ミリグラム試料を用いて、Seiko Instruments, Inc.(日本、東京所在)からの商標「SEIKO EXSTAR 6000」の下で商業的に入手可能なDSC分析器によって実施される。データは、同様にSeiko Instruments, Inc.(日本、東京所在)からの商標「DSC Measurement V 5.7」及び「DSC Analysis V5.5」の下で商業的に入手可能なソフトウェアを使用して分析される。試験についての温度プロファイルは、(i)25℃から160℃への加熱速度10ケルビン/分(第1の加熱期間)、(ii)160℃から20℃への冷却速度10ケルビン/分、及び(iii)20℃から260℃への加熱速度10ケルビン/分(第2の加熱期間)を含む。ガラス転移温度は、第2の加熱期間の熱流特性だけを使用して決定される。
粒度及び粒度分布は、Beckman Coulter, Inc.(カルフォルニア州ブレア所在)からの商標「COULTER MULTISIZER II ANALYZER」の下で商業的に入手可能な粒度分析器を使用して測定される。粒度は、D50粒度、D10粒度、及びD90粒度パラメータに基づいて体積基準で測定される。例えば、粒子の試料についての10.0マイクロメートルのD50粒度は、試料内の粒子の50%が10.0マイクロメートルより大きく、試料内の粒子の50%が10.0マイクロメートルより小さいことを意味する。同様に、粒子の試料についての9.0マイクロメートルのD10粒度は、試料内の粒子の10%が9.0マイクロメートルより小さいことを意味する。さらに、粒子の試料についての12.0マイクロメートルのD90粒度は、試料内の粒子の90%が12.0マイクロメートルより小さいことを意味する。
システム10等の電子写真方式の付加製造システムにおいて使用するための粉末ベース材料の摩擦帯電特性又は静電帯電特性は、以下の技法によって決定することができる。7重量部の粉末ベース材料の試験試料は、93重量部のキャリア粒子と共に清浄な乾燥ガラスボトル内で撹拌される。キャリア粒子は、負の帯電用のポリ(メタクリル酸メチル)(PMMA)又は正の帯電用のポリ(フッ化ビニリデン)(PVDF)の1.25重量%のポリマーコーティングでコーティングされたストロンチウムフェライトの磁化された22マイクロメートルのコアを含む。
先に論じたように、本開示の部品材料及び支持材料は、好ましくは、良好な粉末流動特性を示す。これは、現像ステーションにおいてキャリア粒子への部品又は支持材料の供給を通常妨げる、補充給送中の部品又は支持材料の閉塞又は流動制限を減少させるか又は防止する。試料材料の粉末流動性は、二次元電子写真プロセスにおいて利用される市販のトナーと比較して、粉末の流動性を視覚的に観測することによって定性的に測定され、「良好な流動(good flow)」又は「極めて良好な流動(very good flow)」として等級付けられる。
好ましくは、部品材料及び支持材料の溶融レオロジーは、それらのそれぞれのコポリマーの溶融レオロジーと実質的に同じであり、他の添加剤によって悪影響を受けないことが好ましい。さらに、先に論じたように、電子写真方式の付加製造システム(例えば、システム10)と共に使用するための部品材料及び支持材料は、好ましくは、同様の溶融レオロジーを有する。
Claims (19)
- 電子写真方式の付加製造システムによって三次元部品を印刷するための部品材料であって、該部品材料は、
組成物を含み、該組成物は、
半結晶熱可塑性材料と、
荷電制御剤とを含み、
前記部品材料は、D90/D50粒度分布及びD50/D10粒度分布を有する粉末形態で提供され、かつD90/D50粒度分布とD50/D10粒度分布との違いが10%以下であり、
前記部品材料は、前記三次元部品を層ごとに印刷するための層溶融転写アセンブリを備える前記電子写真方式の付加製造システムにおいて使用するために構成される、部品材料。 - 前記組成物は吸熱剤を更に含み、該吸熱剤は前記部品材料の0.5重量%〜10重量%を構成する、請求項1に記載の部品材料。
- D90/D50粒度分布及びD50/D10粒度分布のそれぞれが1.00〜1.40の範囲である、請求項1又は2に記載の部品材料。
- 前記荷電制御剤は、クロムオキシカルボン酸錯体、亜鉛オキシカルボン酸錯体、アルミニウムオキシカルボン酸錯体、及びその混合物からなる群から選択される、請求項1〜3のいずれか一項に記載の部品材料。
- 前記荷電制御剤は、前記部品材料の0.1重量%〜5重量%を構成する、請求項1〜4のいずれか一項に記載の部品材料。
- 前記組成物は、前記部品材料の0.1重量%〜10重量%を構成する流動制御剤を更に含む、請求項1〜5のいずれか一項に記載の部品材料。
- 前記半結晶熱可塑性材料は、ポリアミド、ポリエチレン、ポリプロピレン、ポリオレフィンブロックコポリマー、ポリオキシメチレン、ポリアリールエーテルケトン、又はそれらの混合物を含む、請求項1〜6のいずれか一項に記載の部品材料。
- 前記半結晶熱可塑性材料は、前記ポリアミドを含み、該ポリアミドはポリカプロラクタム(PA6)、ポリヘキサメチレンアジポアミド(PA6,6)、ポリヘキサメチレンノナミド(PA6,9)、ポリヘキサメチレンセバカミド(PA6,10)、ポリアミド6/12(PA6,12)、ポリエナントラクタム(PA7)、ポリウンデカノラクタム(PA11)、ポリラウロラクタム(PA12)、又はそれらの混合物を含む、請求項7に記載の部品材料。
- 前記ポリアミドは、PA6;PA6,6;PA6,12;PA11;ポリラウロラクタム(PA12);又はそれらの混合物を含む、請求項8に記載の部品材料。
- 前記半結晶熱可塑性材料は、前記ポリアリールエーテルケトンを含み、該ポリアリールエーテルケトンはポリエーテルケトン(PEK)、ポリエーテルエーテルケトン(PEEK)、ポリエーテルエーテルケトンケトン(PEEKK)、ポリエーテルケトンエーテルケトンケトン(PEKEKK)、又はそれらの混合物を含む、請求項7に記載の部品材料。
- 前記ポリアリールエーテルケトンは、ポリエーテルエーテルケトン(PEEK)を含む、請求項10に記載の部品材料。
- 電子写真エンジンと転写媒体と層溶融転写アセンブリとを備える電子写真方式の付加製造システムによって三次元部品を印刷する方法であって、
部品材料を前記電子写真方式の付加製造システムに提供することであって、前記部品材料は、組成的に、荷電制御剤と半結晶熱可塑性材料とを含み、また、D90/D50粒度分布及びD50/D10粒度分布を有する粉末形態を有し、かつD90/D50粒度分布とD50/D10粒度分布との違いが10%以下であり、
負電荷又は正電荷及び5マイクロクーロン/グラム〜50マイクロクーロン/グラムの範囲にある大きさを有するQ/M比に前記部品材料を摩擦帯電させることと、
前記電子写真エンジンによって、前記帯電した部品材料から前記三次元部品の層を現像することと、
前記現像された層を、前記電子写真エンジンから前記転写媒体に静電吸着させることと、
前記転写媒体によって、前記吸着された層を前記層溶融転写アセンブリまで移動させることと、
前記層溶融転写アセンブリによって、前記移動した層を前記三次元部品の先に印刷された層に溶融転写させることとを含む、方法。 - D90/D50粒度分布及びD50/D10粒度分布のそれぞれが1.00〜1.40の範囲である、請求項12に記載の方法。
- 前記荷電制御剤は、前記部品材料の0.1重量%〜5重量%を構成する、請求項12又は13に記載の方法。
- 前記部品材料は、該部品材料の0.1重量%〜10重量%を構成する流動制御剤を更に含む、請求項12〜14のいずれか一項に記載の方法。
- 前記半結晶熱可塑性材料は、ポリアミド、ポリエチレン、ポリプロピレン、ポリオレフィンブロックコポリマー、ポリオキシメチレン、ポリアリールエーテルケトン、又はそれらの混合物を含む、請求項12〜15のいずれか一項に記載の方法。
- 前記半結晶熱可塑性材料は、前記ポリアミドを含み、該ポリアミドはポリカプロラクタム(PA6)、ポリヘキサメチレンアジポアミド(PA6,6)、ポリヘキサメチレンノナミド(PA6,9)、ポリヘキサメチレンセバカミド(PA6,10)、ポリアミド6/12(PA6,12)、ポリエナントラクタム(PA7)、ポリウンデカノラクタム(PA11)、ポリラウロラクタム(PA12)、又はそれらの混合物を含む、請求項16に記載の方法。
- 前記ポリアミドは、PA6;PA6,6;PA6,12;PA11;ポリラウロラクタム(PA12);又はそれらの混合物を含む、請求項17に記載の方法。
- 前記半結晶熱可塑性材料は、前記ポリアリールエーテルケトンを含み、該ポリアリールエーテルケトンはポリエーテルケトン(PEK)、ポリエーテルエーテルケトン(PEEK)、ポリエーテルエーテルケトンケトン(PEEKK)、ポリエーテルケトンエーテルケトンケトン(PEKEKK)、又はそれらの混合物を含む、請求項16に記載の方法。
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