| 摘要 |
A plurality of sheets of booklet paper (F1) placed on top of each other have a printed substance (1), such as ink, on binding locations in the central areas of the inside pages, and after stacking the sheets, pressure is applied from both sides in the direction of stacking, by binding members (18, 19) each having a series of ridges and grooves. The fibers of the paper and the printed substance then become intertwined, resulting in binding. The printed substance soaks into the fibers of the paper, thereby forming a coating film surface on the paper surface, increasing the strength and flexibility of the paper, and increasing the stretch ratio of the fibers. Consequently, the coating film surface also extends deeply into and becomes entwined with the fibers of the paper, and solidifies while being intertwined in a complex manner with the components of the printed substance, thereby resulting in a strong bind. The ridges of the binding members (18, 19) have two height levels: the taller ones correspond to the inside part of the stacked paper and the shorter ones correspond to the outside part thereof. Due to the height differences of the convexities, the pressure load on the fibers of the paper is distributed, allowing stable binding.
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