J-Z Fold Sheet Stack for Narrow Width and Uniform Layering

The sheet is divided into four distinct panels (first, second, third, and fourth panels) with specific fold lines creating a J-Z fold pattern. This segmentation allows each panel to be positioned independently, preventing ply buildup by ensuring that sheets interfold uniformly without overlapping layers. The center panel (second panel) acts as a stable base while the V-folded top portion (third and fourth panels) creates a balanced structure that maintains consistent stack width.

The J-Z fold configuration uses asymmetric panel arrangements where the bottom panel (second panel) has a different width relationship to the center panel compared to the top V-folded portion. The fold lines are positioned at specific asymmetric locations to create a balanced but non-uniform structure that prevents ply buildup. The asymmetric design allows the sheet to fold into a narrow stack width while maintaining structural integrity and uniform layer distribution.

The folding board is configured with pre-positioned fold lines and panel definitions before the sheet is fed through. The first fold line, second fold line, and third fold line are established in advance at specific positions relative to the sheet width. This preliminary configuration ensures that when the sheet is folded, each panel automatically assumes its correct position and orientation, achieving narrow stack width without requiring complex real-time adjustments or multiple folding passes.

The folding board incorporates adjustable components that allow the fold lines and panel configurations to be dynamically modified based on sheet width and desired stack width. The folding mechanism adapts to different sheet dimensions while maintaining the J-Z fold geometry, enabling the production of narrow stacks from various wide or medium width sheets without compromising the uniformity of the fold or causing ply buildup.

The J-Z fold introduces a fourth panel dimension by V-folding the top portion of the sheet, creating a three-dimensional structure that efficiently packs the sheet width. The third and fourth panels are folded at an angle to the center panel, utilizing vertical and diagonal dimensions to reduce the horizontal stack width. This dimensional approach allows a 200 mm wide sheet to be compressed into an 87 mm stack width, significantly narrower than conventional two-panel V-folds.

The fold configuration changes the geometric parameters of the sheet by introducing specific fold angles and panel width ratios. The J-Z fold uses a center panel with a width-to-length ratio optimized for narrow stacking, and the V-folded top portion uses angled folds that project less horizontally than conventional folds. These parameter changes in fold geometry and panel dimensions enable the achievement of narrower stack widths while maintaining sheet integrity and dispensability.