How to check the reasons when there is regular scratches on tempered glass?

1.If scratches appear in the longitudinal direction of tempered glass:

Check if there are any debris on the heating furnace and cooling section roller conveyor

Check if there are any debris or broken glass in the middle of the rollers in the heating furnace and cooling section

Check if the door of the heating furnace is in contact with the upper and lower surfaces of the glass

2.If scratches appear in the transverse direction of tempered glass:

Check if the glass touch with the furnace door in the heating furnace

Check if the transmission encoder of the heating furnace is working properly

Check if the length measurement data of the photoelectric switch on the loading table is accurate