Folding & CreasingDownload PDF
When it comes to printed materials, folding can be used to tell a story and control how the content is revealed. There are many ways to fold a piece of paper: Basic fold (single fold, half-fold, tri-fold…), accordion or “Z” fold, parallel fold, roll fold, gate fold, map fold or more complex folds. The way a paper folds and unfolds is an integral part of the presentation of your brochure, and should be considered right from the early design stage.
- Do check the quality of folding during production on a continuous basis. If cracking is evident, stop. An adjustment may well rectify the problem.
- Do fold parallel to the fibre direction, to avoid cracking. Always make the final fold parallel to the grain.
- Do fold into the bead. Folding around the bead is likely to produce cracking, the exception being Curious Collection Translucents papers that should be folded away from the bead. Note that Curious Collection Translucents go white when they are creased.
- Do ensure a minimum distance of 4-6 mm between parallel folds - essential on 200gsm and above for Curious Collection Translucents.
- Do choose the creasing tool designed to suit the paperboard type and its thickness (usually 2pt). The paper thickness is the most important variable. The crease depth should be the same as the paper thickness.
- Do use a creasing rule and matrix system to achieve the best creasing characteristics. The width of the matrix is determined by the thickness of the creasing rule (2pt) and calliper of substrate. For boards under 600 microns, the matrix channel width is 1.5 times the thickness of the board plus the 2pt rule (0.7mm). Matrix height is the thickness of the board. The best creases are obtained by using fat-bed equipment.
- Don’t print dark areas or images across the predominant folds, to avoid cracking. With Curious Collection Skin and Curious Collection Translucents papers, sharp-edged creasing tools must not be used. The creasing rule should be centred on the creasing channel.
- Don’t plan to apply UV varnish in areas to be creased. Leave narrow channels in the crease areas.
- Don’t fold a board over 170g (140g for Curious Collection Translucents) without prior creasing; otherwise it will crack when folding. Creasing will produce a linear depression, to enable the material to be bent (folded) along the line of the crease, thus achieving durable and narrow fold lines with no disfiguring cracks on the printed or laminated folds.
- Don’t subject the printed materials to dry conditions. Folding quality deteriorates as the moisture content of the substrate decreases. Especially for Translucent papers, the relative air humidity in the finishing and storage rooms should be about 50%