the subject invention relates to a precision injection molding of multi - piece parts and the subsequent handling and assembly of those parts produced from the mold . in an exemplary embodiment , a surgical suture package with a top part and a bottom part is molded and assembled . in such a method and system , the top parts and bottom parts are first molded utilizing a family mold and then are transferred to a stacker . the stacker is able to stack the top part and bottom part on top of one another on a pallet . the parts are then transported to a welder in order to weld the top part and bottom part together . the completed surgical suture packages are then transferred to a magazine for storage and shippage .