Booklet production apparatus and image forming system

A booklet production apparatus comprising:

• An elongate heating pressurization unit configured to, in a state where a plurality of sheets in which adhesive layers are formed is piled up, heat and pressurize the adhesive layers, the heating pressurization unit including a pressurization plate configured to come into contact with the sheets and pressurize the sheets, a heating member configured to heat the pressurization plate, a reception member opposed to the pressurization plate, and a pressurization mechanism configured to apply a pressure to the sheets nipped between the pressurization plate and the reception member,
• wherein the booklet production apparatus is configured to produce a booklet by, while nipping the plurality of sheets in which the adhesive layers are formed between the pressurization plate and the reception member, heating and pressurizing the adhesive layer formed in the sheets, and
• wherein in a case where a region of the heating pressurization unit in a longitudinal direction of the heating pressurization unit where the heating pressurization unit heats and pressurizes a sheet of a maximum size is a first region, and a region of the heating pressurization unit in the longitudinal direction where the heating pressurization unit heats and pressurizes a sheet of a minimum size is a second region, and a region of the heating pressurization unit inside the first region and outside the second region in the longitudinal direction is a third region, the heating pressurization unit heats and pressurizes the sheet of the maximum size with a pressurization force profile having a minimum value in the longitudinal direction at a position in the third region or a position of an end portion of the second region adjacent to the third region, and a region where the pressure greater than the minimum value is applied is present in the third region and on a side opposite to a side where the second region is present with respect to the position of the minimum value in the longitudinal direction.