Artículos de publicaciones periódicas

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Application of material jetting technology for the development of incision and closure surgical devices
(2022) Sandre, Cristian; De Bernardez, Leopoldo; Poggi, Luciano; Sanguinetti, Juan Manuel
"Material Jetting technology has proven to be very useful in the manufacture of parts with a variety of shapes, consistencies, textures, transparencies and colours, and a great diversity of mechanical properties can be achieved, from low hardness elastomers to rigid materials. Applications range from manufacturing parts in limited production runs with bright, colourful designs to be distributed as marketing items to functional prototypes that closely resemble final products. The possibility of creating digital materials with a wide range of mechanical properties by combining resins that polymerize with UV light makes it possible to approach the final properties of a piece that will later be produced on a larger scale with commercial polymers, both thermoplastic and elastomers, through traditional manufacturing processes such as injection moulding, compression moulding or thermoforming. Keeping in mind these advantages, we have used Polyjet technology for the development of incision and closure surgical devices. The prototypes were manufactured using a combination of resins that allow the properties of commercial elastomers, potentially used for the final product, to be approached. The characteristics of the device, the requirements of the prototypes, and the mechanical properties of the combinations of resins that were considered suitable for this application are described. The differences found between the experimental results and the values reported in the data sheets of the digital materials that were used are discussed."
Efects of infll patterns on part performances and energy consumption in acrylonitrile butadiene styrene fused flament fabrication via industrial‐grade machine
(2022-06-18) De Bernardez, Leopoldo; Campana, Giampaolo; Mele, Mattia; Sanguinetti, Juan Manuel; Sandre, Cristian; Mur, Sebastián
"The industrial applications of Additive manufacturing technologies and systems are quickly increasing due to the high flexibility in the part design allowing for mass customisation and reduction of material usage. Besides the absence of manu-facturing tools permits a reduction of the time to market. Despite these relevant advantages, building time is generally high and it can typically determine significant energy consumption. Several studies investigate the effect of infill patterns on material mechanical properties to address the design of deposition patterns but these works do not take into consideration relevant aspects related to the manufacturing stage, such as the energy consumption, both the building paths and time. The choice of the infill pattern greatly affects the balance amongst part performances, energy and material consumption. On the other hand, a reduction of the deposited material can effectively reduce the building time and then the process energy. In the present paper, an index that quantifies this balance for a largely used Additive Manufacturing technology is introduced. For this purpose, an experimental investigation is carried out by monitoring the process energy during the manufacturing of specimens characterised by different infill patterns. Then, physical and mechanical properties are measured to compose the proposed index."

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