A binding device includes: an upper teeth portion having at least one teeth row that forms unevenness in a recording material bundle; a lower teeth portion having at least one teeth row that forms unevenness in the recording material bundle and being paired with the upper teeth portion; and at least one holding portion that holds the recording material bundle at a position different from a position where the upper teeth portion and the lower teeth portion have a binding function, when binding processing is performed by the upper teeth portion and the lower teeth portion.

A recording medium post-processing device includes a binding unit and a hole forming unit. The binding unit performs a binding process on a recording medium bundle. The hole forming unit performs a hole forming process in a region of recording media that constitute the recording medium bundle including a part of a binding region in which the binding process is performed.

A medium processing apparatus includes a liquid applier, a crimper, a stapler, and circuitry. The liquid applier applies liquid to a liquid application position of a medium. The crimper presses and deforms at least a part to which the liquid is applied by the liquid applier, to bind a plurality of media including the medium to which the liquid is applied. The stapler performs stapling with a staple on a medium bundle in which the plurality of media is bound by the crimper. The circuitry controls operations of the crimper, the liquid applier, and the stapler, and selectively switches between first binding performed by the liquid applier and the crimper and second binding performed by only the stapler, in accordance with information on the medium or a binding position at which the medium bundle is bound by the crimper.

A recording material processing apparatus includes first teeth that are used for binding processing of a recording material bundle; second teeth that move toward the first teeth and press the recording material bundle located between the first teeth and the second teeth; a guide portion that guides an interlocking portion interlocking with the second teeth; and a guided portion that is provided in the interlocking portion and guided by the guide portion, in which one of the guide portion and the guided portion includes a hole, and the other includes a rod-shaped portion that extends in a movement direction of the interlocking portion and comes into contact with an inner surface of the hole.

Disclosed is a coreless roll of a tissue paper product made of a spirally wound continuous web having a first end and second end and an outer diameter in the range of 95 to 150 mm, the web of tissue paper product being wound to define an inner hole centrally positioned relative to the coreless roll such that the first end is located on the outer side of the coreless roll and the second end is located at the inner hole, a diameter of the inner hole being 20 to 50 mm, a density of the coreless roll being 80 to 150 kg/m.sup.3, and a caliper ratio of the roll being 10% to 80%, the tissue paper product including between two and four ply-bonded plies, at least one ply being Conventional Wet Press, and at least one ply being a structured ply.

A recording material processing apparatus includes: first teeth that are used for binding processing of a recording material bundle; second teeth configured to move toward the first teeth and to press the recording material bundle positioned between the first teeth and the second teeth; a first metal block configured to support the first teeth; and a second metal block configured to support the second teeth.

A medium processing apparatus includes a conveyor, a liquid applier, and a crimper. The conveyor conveys a medium. The liquid applier applies liquid to the medium conveyed by the conveyor. The crimper presses and deforms a medium bundle including at least one medium to which the liquid is applied by the liquid applier, to bind the medium bundle. The liquid applier selectively performs application of the liquid to all media constituting the medium bundle or application of the liquid to only some of the media constituting the medium bundle, based on a conveyance interval at which the media are conveyed by the conveyor.

A medium processing apparatus includes a conveyor, a liquid applier, and a crimper. The conveyor conveys a medium. The liquid applier applies liquid to a part of the medium conveyed by the conveyor. The medium is at least one medium. The crimper presses and deforms a bundle of media including the medium to which the liquid is applied by the liquid applier, to bind the bundle of media. The liquid applier includes a liquid application member and a retained liquid amount detector. The liquid application member applies the liquid to a position to be bound by the crimper on the medium. The retained liquid amount detector detects an amount of the liquid retained by the liquid application member.

A medium processing apparatus includes a conveyor, a liquid applier, and a crimper. The conveyor conveys a medium. The liquid applier performs liquid application of applying liquid to a part of the medium conveyed by the conveyor, the medium being at least one medium. The crimper presses and deforms a bundle of media including the medium to which the liquid is applied by the liquid applier, to bind the bundle of media. The liquid applier adjusts an application amount of the liquid in the liquid application according to an environmental condition that is a factor that affects a binding strength with which the bundle of media is bound by pressing and deforming of the crimper.

A binding apparatus includes a binder configured to bind sheets of paper by advancing binding teeth toward the sheets of paper, a water supplier configured to supply a preset amount of water to the sheets of paper to be bound by the binder, and a processor configured to, if a specific condition is satisfied, make a setting to reduce the amount of water to be supplied to the sheets of paper by the water supplier.