Microfluidic structures made by 3D printing based direct prototyping in Objet Polyjet technology

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Dr. Sántha Hunor
Department of Electronics Technology

An innovative method in 3D printing, in particular Rapid Prototyping Technology (RPT) using acrylic-based photopolymer material have been measured and classified. The resolution of the device (0.0006”) allows to create a variety of microfluidic structures. The advantage of 3D printings both speed and cost effectiveness. This leading-edge technology is capable to creating prototype assembly within one day.

The test samples made by Objet Eden 250 RPT device, examined under microscope, and created individual image processing algorithms to each structure. Accuracy of the procedures have been checked by creating cross-section samples. Furthermore, thermal bonded samples printed by 3D RPT have been investigated, used pressurized air to measure the bond strength.

RPT device realise fan-like branching microfluidic channels less than 3° margin of error. This value can be improve with create larger angle between channels. Meander systems in microfluidic devices are useable from 0.02” radius of curvature, with channel width of 0.025”. Printed elliptic cylinders base areas compared to the theoretical one, ratio can not be reduced under 135% in the size of microfluidic applications range. 250 images have been created under microscope, 30 from this were cross-section samples, and further 30 thermal bonded models has been investigated.

3D RPT created thermal bonded microfluidic structures’ bond strength could be measured at maximum 250 kPa (35 psi) of air pressure. However, each test sample endure this pressure value without any mechanical damage. Above this rate, an additional measurement configuration shall be necessary.


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