Sheet processing apparatus and image forming system

A sheet processing apparatus comprising:

• a stacking unit configured to stack a plurality of sheets which are conveyed one by one in a state where an adhesive is applied thereto;
• an alignment unit including a supporting portion on which the sheets are loaded, the alignment unit being configured to align positions of the sheets loaded on the supporting portion;
• and
• a bonding unit configured to bond the sheets loaded on the supporting portion to each other,
• wherein after a first sheet stack is loaded on the supporting portion and aligned by the alignment unit and then a second sheet stack stacked in advance in the stacking unit is loaded on the first sheet stack, the alignment unit is configured to align a position of the second sheet stack with the first sheet stack, and
• wherein the bonding unit is configured to heat and pressurize the second sheet stack aligned by the alignment unit such that sheets of the second sheet stack are bonded to each other with the adhesive and the first sheet stack and the second sheet stack are bonded to each other with the adhesive.