2025-05-01 株式会社リコー
リコーは、生体適合性を有し高強度かつフルカラー出力が可能な3Dインクジェットプリンター技術を開発した。マテリアル・ジェッティング方式を基に、独自配合のフィラーインクと最適化されたプロセスを採用し、強度と審美性を兼ね備えたレジン成型物の造形を実現。歯科補綴物やメガネフレームなどのオーダーメイド製品に応用可能で、色調グラデーションの再現や歯と歯肉の一体成型も可能。医療や産業への展開が期待されている。
図1. 本技術で造形した入れ歯
<関連情報>
- https://jp.ricoh.com/release/2025/0501_2
- https://link.springer.com/article/10.1007/s00170-024-14709-y
フィラー添加インクを用いたマテリアルジェッティングによる高強度カラーレジンコンポジットの作製 Fabricating high-strength color resin composite via material jetting using ink with added fillers
Hiroyuki Naito,Yuki Shingai & Noriaki Okada
The International Journal of Advanced Manufacturing Technology Published:31 October 2024
DOI:https://doi.org/10.1007/s00170-024-14709-y
Abstract
The mechanical properties of models are crucial in determining the industrial applications of additive manufacturing techniques. Material jetting (MJ) has been primarily limited to mold-making, prototyping, etc., owing to its low strength. Low viscosity and rapid curing, which are essential ink characteristics of MJ, lead to the low strength of MJ models. This study aimed to develop methods to increase the strength of MJ models by adding fillers to the ink. We optimized the shape and size of the filler, modified the surface properties, and optimized the methacrylate monomer formulation of the ink. To develop a colorization process suitable for filler-added inks, we investigated a method to apply transparent ink over small-colored ink droplets. We achieved a bending strength of 180 MPa for colorless models and 177 MPa for colored models, which is remarkable compared to the typical MJ product strength of 90 MPa or less. These findings clarify the design guidelines for high-strength MJ ink, making the direct manufacturing of production parts requiring both esthetic beauty and high strength in colors, such as artificial teeth, dentures, and eyeglass frames, more realistic.
