Читать книгу 3D Printing of Foods - C. Anandharamakrishnan - Страница 53

Binder jetting is also referred to as the liquid binding where the powdered material gets deposited in a layer‐by‐layer manner with the selective dispensing of liquid binder based on a 3D data file. The process involves the accumulation of the powdered layers through direct fusion with the ejection of binder solution from the printhead (Le‐Bail et al. 2020). Here, the binder fuses the cross‐section of one layer with the succeeding layer thereby forming a 3D object (Figure 2.12). The working principle of the binder jetting technique is similar to that of inkjet printing apart from spraying the liquid binder droplets instead of food ink as in inkjet printing. Binder jetting allows us to fabricate complex 3D porous structures with precise control over the micro and macro structures of the material supply (Farzadi et al. 2014). The unfused powder materials act as a support during the fabrication of a 3D structure that can be easily removed after the completion of printing and can be recycled for further use. One of the attractive features of binder jetting technology is the production of colourful 3D structures. Variation in the liquid binder composition helps in the creation of complex, delicate, and attractive coloured 3D objects (Sun et al. 2015). Due to the spray of liquid binder over the food substrate, the fabricated 3D construct would require an additional drying process for removing the residual moisture. Further, the drying treatment improves the structural stability and the mechanical integrity of the 3D construct (Vithani et al. 2019). Considering the food applications, binder jetting is limited with its applicability only to the powdered materials and the use of edible binder considering food safety.

Figure 2.12 Schematic diagram of binder jetting.