藉由層積冷凍成型(Deposition Freezing Manufacturing, DFM)來製造具特定結構與外型的三維支架時，會因為製作環境溫度、噴嘴尺寸、噴頭移動速度、及材料噴擠壓力等因素，影響支架製作的品質，造成製作出的支架有坍塌、變形、孔洞不一的問題，所以本研究將探討影響支架製作品質的因素並加以控制，來達到精確地製作出三維支架，以及解決支架懸空變形的問題。 本研究藉由固定製作參數來控制製備材料的品質；設計新型圓筒型製作平台，提升更大範圍且溫度穩定的製作環境，可製作2.5公分高的支架；觀測噴擠材料凝固速度，得知材料凝固時間在6~10秒間，支架不會產生翹曲或坍塌；分析固定材料噴擠壓力下，噴頭直線與轉彎速度對線徑的影響，發現當噴頭直線速度與轉彎速度為1:1.67時，支架直線與轉彎處線徑將最相近。並藉由嘗試各種水溶性支撐材料，配合以雙噴頭分別噴擠支架與支撐材料的製作方式，製作出具懸空斜面的三維支架。 製程的改善，讓300個支架製作良率提升為90%。由SEM觀察，所製作的支架結構與外型更接近預先設定的模型、支架線徑誤差小於3μm、孔洞大小更接近設計值，也因此支架含水率也增加。 Use the Deposition Freezing Manufacturing(DFM) to fabricate the purposive structure of the scaffolds, we know the working temperature, the size of nozzle, the movement speed of nozzle, and the pressure of deposition will affect the quality of scaffold, to cause the scaffold collapsing, changing shape, and hard to control the pore size. So the study will confer and control these factors let the 3D scaffold can be accurately fabricated and solve the problem of the suspended in midair scaffold changing shape. The study fixes the fabricating parameter to control the quality of material; to design a new cylindrical production platform to promote the low temperature production environment of large range and stable temperature to fabricate a scaffold high then 2.5cm; to observe the clotting speed of the deposition material knows the clotting speed at 6-10 seconds, the scaffolds will not effect warpage and collapse; to analyze the influence of the pressure and speed on fiber size, when the straight and turn speed ratio is 1:1.67, the straight and turn fiber size is the most close. And we try many kinds of water-soluble support materials to cooperate with two-nozzle spurting scaffold and support materials to fabricate the suspended in midair 3D scaffold of an inclined plane. The improving of the process let the fabricating yield of 300 piece scaffolds be 90%. The structure and appearance of the scaffolds are more close the design model in advance, the fiber size error less than 3μm, the pore size is more close the design, so the scaffold moisture content is increasing.
