Provided is a sheet folding apparatus for folding sheets, including: a feeding-roller pair; a loop-forming space provided downstream from the feeding-roller pair, for forming a sheet loop; a pushing member for pushing the looped sheet; a folding-roller pair for nipping a prescribed part of the sheet pushed by the pushing member, thereby to fold the sheet; and a path provided between the feeding-roller pair and the folding-roller pair, for guiding the sheet fed from the feeding-roller pair toward the loop-forming space.

In a zig-zag folded stack of paper web, particularly a stack of recycling paper web, wherein at least one fold of the zag folded stack of paper web is provided with a perforation-tie-row, wherein the ties of the fold coupled to folding-web-she folded above one another, wherein the fold tie in the perforation, each, comprise a maximal longitudinal direction [respective] in the longitudinal fold direction, it is provided that at least one section of a fold comprises a perforation-fold-row of at least five alternatingly arranged ties and perforations, wherein a ratio of a summed up combined longitudinal extension of the folding ties within the section in relation to a summed up combined longitudinal extension of the perforations of the same number within the folding section is larger than or equal to 0.8, preferably larger than or equal to 1.

In a zig-zag folded stack of paper web, particularly a stack of recycling paper web, wherein at least one fold of the zag folded stack of paper web is provided with a perforation-tie-row, wherein the ties of the fold coupled to folding-web-she folded above one another, wherein the fold tie in the perforation, each, comprise a maximal longitudinal direction [respective] in the longitudinal fold direction, it is provided that at least one section of a fold comprises a perforation-fold-row of at least five alternatingly arranged ties and perforations, wherein a ratio of a summed up combined longitudinal extension of the folding ties within the section in relation to a summed up combined longitudinal extension of the perforations of the same number within the folding section is larger than or equal to 0.8, preferably larger than or equal to 1.

A post-processing apparatus includes a blade, a transfer mechanism, a sheet folding roller pair, a motor, a drive control device, and a control device. The blade presses into the sheet to form a fold line in the sheet. The transfer mechanism moves the blade toward and away from the sheet. The sheet folding roller pair conveys the sheet with the fold line formed by the blade by pinching the sheet at a nip between the sheet folding roller pair. The motor rotatively drives the sheet folding roller pair. The drive control device controls drive of the motor. The control includes a control circuit. When, through the processor executing a control program, the control device controls the transfer mechanism to withdraw from the nip the blade having been pressed into the sheet and the nip by the transfer mechanism, the control device controls the drive control device to stop the motor.

A post-processing apparatus includes a blade, a transfer mechanism, a sheet folding roller pair, a motor, a drive control device, and a control device. The blade presses into the sheet to form a fold line in the sheet. The transfer mechanism moves the blade toward and away from the sheet. The sheet folding roller pair conveys the sheet with the fold line formed by the blade by pinching the sheet at a nip between the sheet folding roller pair. The motor rotatively drives the sheet folding roller pair. The drive control device controls drive of the motor. The control includes a control circuit. When, through the processor executing a control program, the control device controls the transfer mechanism to withdraw from the nip the blade having been pressed into the sheet and the nip by the transfer mechanism, the control device controls the drive control device to stop the motor.

A post-processing apparatus (1) includes a first conveyance path (41), a first processing part (55), a second conveyance path (95) and a merging conveyance path (97), and the first processing part (55) includes a conveying rollers pair (80) including a first roller (81) and a second roller (83) conveying the sheet along a first direction; a first folding rollers pair (84) including the first roller (81) and a third roller (85) forming a first nip, conveying the sheet along a second direction and performing a folding processing along a first fold line; a second folding rollers pair (86) including the third roller (85) and a fourth roller (87) forming a second nip, conveying the sheet along a third direction and performing a folding processing along a second fold line; a first folding guide (89) movable to the first nip; and a second folding guide (91) movable to the second nip.

A sheet folding device includes a sheet conveyance path, a first folding conveyance path, a first folding roller pair, a first folding guide, and a conveyance roller. The first folding roller pair is composed of a first roller and a second roller forming a first folding nip by being brought into pressure contact with an upstream side of the first roller. The first folding guide is movable between a folding position at which it approaches the first folding nip, guiding a to-be-folded part of a sheet to the first folding nip, and a retracted position at which it is away from the first folding nip. The conveyance roller forms, together with the second roller, a first assist roller pair that conveys the sheet along the sheet conveyance path. The first folding guide has a pivot fulcrum on a downstream side relative to the first folding nip in the conveyance direction.

Packaging material is provided. The packaging material can include at least one web layer having a surface that includes first and second regions. When corresponding first regions are overlaid with each other and corresponding second regions are overlaid with each other, the overlaid first and second regions can cooperatively surround a cavity. The packaging material further can include a first sealing material disposed in the first region and configured to seal together the corresponding first regions upon application of first conditions to the first sealing material, and a second sealing material disposed in the second region and configured to seal together the corresponding second regions upon application of second conditions to the second sealing material. The second sealing material can be configured such that the first conditions applied to the second sealing material are insufficient to cause the second sealing material to seal.

To prevent displacement of first fold positions and collapse of discharged and stacked sheets when sheet fold processing is performed a plurality of times for each sheet. First fold processing is applied to a sheet conveyed to a conveying path by a rotating body pair 22. The sheet that has been subjected to the first fold processing is fed back to the conveying path while a first fold line is being opened. Then, second fold processing is applied to the sheet that has been fed back to the conveying path by the rotating body pair 22. The resultant sheet is discharged with the first fold line opened.

An interleaving unit, comprising a pair of rolls (1, 2) set alongside one another and counter-rotating and provided with respective first and second folding tools (3, 4; 5, 6) set at a distance from one another along the circumferential development of the respective peripheral surfaces so as to operate in a common point of tangency (Z) on a succession of sheets (7a, 7b) fed between the two rolls, said tools (3, 4; 5, 6) being set on respective mobile cylinder sectors (8, 9, 10, 11) to enable positioning thereof at an adjustable distance apart along the circumferential development of a corresponding roll (1, 2), said interleaving unit comprising means (M1, M2, U) for independently adjusting the speed of rotation of one or more of said sectors according to their angular position in order to reduce or increase the peripheral speed of said sectors with respect to a speed of feed (Vm) of said sheets.