Additive Manufacturing Technologies: An Overview about 3D Printing Methods and Future Prospects

Table 8

Injection-polymerisation (JP-SL).

Resin Injection (Projection) and Ultraviolet Light Photopolymerisation
	A head with thousands of injectors deposits drops of liquid resin that are hardened using two UV ray lights fitted on the sides of the selfsame head. Two materials can be used simultaneously (bi-material pieces) [18].
	The minimum layer thickness is 0.017 mm.
	The range of materials is extremely extensive and includes translucent resins, polypropylene, ABS and elastic resins. Properties of the SCI White (PolyJet) material: tensile modulus: 2500 Mpa; tensile strength: 58 Mpa; elongation at rupture: 10-25 %; flexural modulus: 2700 Mpa; bending strength: 93 Mpa; deformation under load temperature: 48°C.
	Advantages and disadvantages; The quality and surface finish are good or very good. Great precisions and transparent parts can be obtained.; Equipment and materials are expensive. They have problems to obtain pieces with cantilevers or internal holes due to the difficulty of removing the supports.