Provided is a sheet thermocompression apparatus for bonding a plurality of sheets to one another, the sheet thermocompression apparatus including: a loading portion in which sheets having adhesion toner formed thereon are loaded in a loading direction; and a thermocompression unit including a pressing member elongated in a longitudinal direction, for pressing the sheets loaded in the loading portion in the loading direction, and a heating source for heating the pressing member. In a case where the pressing member is viewed from the loading direction, the pressing member overlaps a region of a sheet loaded in the loading portion from one end portion to the other end portion in the longitudinal direction. The heating source is capable of heating an end portion and a center portion of the pressing member in the longitudinal direction to different temperatures.

Disclosed is an image forming apparatus that includes a process cartridge including a recording material; an image former that form a first image for a body and a second image for adhesion on a sheet by using a recording material; a sheet bonder that bond together a predetermined number of sheets on which at least one image has been formed; one or more memory devices that store a set of instructions; and one or more processors that execute the set of instructions to: set a density level of an image to be formed, and based on the set density level, individually control densities of the first image and the second image.

An image forming apparatus includes a first development part provided with an image forming developer containing image forming pigments and image forming macromolecular compound, a second development part provided with a bonding developer containing bonding macromolecular compound, a transfer part transferring the image forming developer to a surface of a medium, and a fuser part fusing the image forming developer to the medium. Wherein heating temperature T1 ( C.) for the image forming developer by the fuser part and heating temperature T2 ( C.) for the bonding developer by the fuser part satisfy a condition expressed by Eq. (1) below, and solubility parameter 1 of the image forming macromolecular compound and solubility parameter 2 of the bonding macromolecular compound satisfy a condition expressed by Eq. (2) below.
10 C.T1T230 C.(1)
5.9|12|7.4(2)

A heater heats sheets to which a powder adhesive has been applied in a binding margin. A pressing member manufactures a booklet by applying pressure to the sheets. In a first adhesion mode, an application amount of the powder adhesive applied to the binding margin is a first application amount and a heat parameter proportional to an amount of heat applied to the sheets is a first value. In a second adhesion mode, the application amount of the powder adhesive applied to the binding margin is a second application amount and the heat parameter is a second value. The first value is higher than the second value. The first application amount is lower than the second application amount.

An image forming apparatus includes an image forming unit configured to form a visible image and a bonding pattern on a sheet, and a bonding unit configured to heat a plurality of sheets in a stacked state, to bond the plurality of sheets together via the bonding pattern. The bonding pattern includes a first side portion, a second side portion, a third side portion, a first corner portion, a second corner portion, and a third corner portion. The second corner portion and the third corner portion are curved such that a minimum value of a radius of curvature of the second corner portion and a minimum value of a radius of curvature of the third corner portion are greater than a minimum value of a radius of curvature of the first corner portion.

An image forming apparatus includes a first development part provided with an image forming developer containing image forming pigments and image forming macromolecular compound, a second development part provided with a bonding developer containing bonding macromolecular compound, a transfer part transferring the image forming developer to a surface of a medium, and a fuser part fusing the image forming developer to the medium. Wherein heating temperature T1 ( C.) for the image forming developer by the fuser part and heating temperature T2 ( C.) for the bonding developer by the fuser part satisfy a condition expressed by Eq. (1) below, and solubility parameter 1 of the image forming macromolecular compound and solubility parameter 2 of the bonding macromolecular compound satisfy a condition expressed by Eq. (2) below.

10 C.T1T230 C.(1)

5.9|12|7.4(2)

Each adhesive toner image is formed so that at least one of the adhesive toner image bonding a front cover and a middle page together and the adhesive toner image bonding a back cover and a middle page together becomes greater in area than the adhesive toner image bonding the middle pages together when viewed from a direction perpendicular to a surface of a recording material, and a booklet is generated so that the adhesive toner image bonding the front cover and the middle page together, the adhesive toner image bonding the back cover and the middle page together, and the adhesive toner image bonding the middle pages together overlap when viewed from the direction perpendicular to the surface of the recording material.

In a case where a region of a 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.

Disclosed is an image forming system having a first mode in which an image forming unit forms toner images and adhesive layers on sheets, and a booklet creation apparatus creates a booklet using the sheets; and a second mode in which the image forming unit forms only adhesive layers on sheets, and the booklet creation apparatus creates a booklet using the sheets. A predetermined temperature of a fixing unit that is set for heating and pressing of a sheet in the fixing unit is lower in the second mode than in the first mode.

A booklet creating apparatus includes a heating-and-pressing unit and a controller. The heating-and-pressing unit heats and presses adhesive layer in a state in which plural sheets, with the adhesive layer formed thereon, are stacked. The controller performs control in such a way as to make a predetermined temperature and/or pressure lower when heating and pressing sheets of minimum size than when heating and pressing sheets of maximum size.