On the one hand we give results concerning affine invariants of the focal surfaces of Minkowski minimal surfaces. Secondly we investigate the behavior of affine invariants in case of association of Minkowski minimal surfaces.S jedne strane mi dajemo rezultate vezane uz afine invarijante žarišnih ploha minimalnih ploha Minkowskog, dok s druge istražujemo karakteristike afinih invarijanata u slučaju pridruživanja kod minimalnih ploha Minkowskog
