There are mainly two causes which cause the problem of overlapping with ends of overlapping not meeting each other neatly

First cause is the steel coils are not evenly cut or slit during the process of slitting which naturally cause the overlapping ends not aligned with seal's section

Solution: adjust the blades of slitting machine to let all the coils slit in parallel level

Second cause is that the feeding guide wheels are not adjusted before the production

Adjust the four wheels in feeding system until the coils are 100% parallel with four guide wheels as shown below video

 

The principle is simple in that the feeding strips are not fed in flat and straight way it would cause the overlapping ends not aligned with seal's section

LIke the video below shows: