Separate the fragments by a distance suitable for crystal thorns. The crystal expands and becomes a tensile member. The tension generated by the white film or the blue film when the crystal expands drives the chips to move, which makes the distance between chips larger and suitable for chip operation. In order to facilitate the operation of manual mounting process, it is necessary to make some extra preparations for chips to expand the distance between chips, so the purpose of crystal expansion is to separate the chips to a distance suitable for threading. In the packaging process, crystal expansion should be carried out before the mounting process. The quality of crystal expansion will directly affect the quality of manual mounting, and then affect the qualified rate of good products.