( ( In ( single-component powders ) ) ( , ( ( the laser ) ( ( ( ( melts ( ( only ( the ( outer surface ) ) ) ( of ( ( the particles ) ( -LRB- ( ( surface melting ) -RRB- ) ) ) ) ) ) , ) ( ( fusing ( the ( solid ( non-melted cores ) ) ) ) ( ( ( to ( each other ) ) and ) ( to ( the ( previous layer ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (JJ single-component) (NNS powders))) (, ,) (NP (DT the) (NN laser)) (VP (VBZ melts) (NP (NP (RB only) (DT the) (JJ outer) (NN surface)) (PP (IN of) (NP (NP (DT the) (NNS particles)) (PRN (-LRB- -LRB-) (NP (NN surface) (NN melting)) (-RRB- -RRB-))))) (, ,) (S (VP (VBG fusing) (NP (DT the) (JJ solid) (JJ non-melted) (NNS cores)) (PP (PP (TO to) (NP (DT each) (JJ other))) (CC and) (PP (TO to) (NP (DT the) (JJ previous) (NN layer))))))) (. .)))
In single-component powders, the laser melts only the outer surface of the particles (surface melting), fusing the solid non-melted cores to each other and to the previous layer.
(ROOT (S (NP (NP (DT The) (JJ outer) (NN core)) (PP (IN of) (NP (DT the) (NN earth)))) (VP (VBZ is) (ADJP (JJ molten))) (. .)))